The most honest review a man could do.

User Rating: 7.5 | Oneechanbara Revolution WII
The good:
-The game is damn cheap
-Surprisingly solid wiimote-based controls make for a unique experience.
-Four different playable characters, each with their two unique fighting styles
-A daunting number of above average unlockable content
-Amusingly goretastic gameplay
-Lots to do, from Survival Mode, Story Mode, Free Play mode, and the option to play co-op (which definitely is a plus)
-Graphics are pretty solid for a wii title, but nothing that'll wow you
-Five difficulties (Easy, Normal, Hard, Violent, Berserk)
-Items are easily found, but not so easily that it feels broken
-Sounds are satisfying, but not top-notch
-Controls are easy to learn, but really hard to master (Cool Combos especially)
-Dismemberment is fun

The bad:
-Story is miserably told, and you will just skip through the cutscenes and mission prompts
-The game will feel relatively fresh through the first playthrough, but environments become heavily recycled with each girl's story (compare to DMC4)
-Gameplay is repetitive and a tiny bit on the shallow side
-Berserk mode gets a little ridiculous at times
-In the end, the four different characters have the same (basic) controls (although their secondary fighting styles are completely different, e.g. Saki can grapple, Reiku has guns, Aya has two swords, and Misery has a giant chain sword thingy)

OTHER NOTES: Goddess Statues and Bloodlust, Leveling up, Comparisons to DMC and other games, Unlockables, Game Modes

I made this review because I am very tired of Gamespot posting these unfairly negative reviews of lower budget games. First of all, it is obvious that this series hasn't been blessed with the budget of, say, Devil May Cry 4 or God of War 3, or even Dynasty Warriors 9999, so to grade the title on that scale is entirely unfair for two reasons: 1) This is a Wii title, and those looking for a gory action game shouldn't be discouraged from buying these titles. Any purchase in this genre helps the Wii's core gamers overall. 2) This game was made on a small budget and didn't have the resources to redefine the industry the way the aforementioned series of games have.

With that in mind, it is also dishonest to give it anything above a 7.5. It has flaws; glaring flaws, actually, that definitely detract from the game experience, and, just like any game of this type, it suffers in the shadow of its peers and the idea of what could have been if only the budget were larger. To completely ignore that there are better titles would be asonine, so I will take a brief look at comparisons with other titles.

Part 1 - Gameplay on the Wii (Controls and General Info)
The game definitely has an advantage over its XBox 360 brother in the Wii controls. They are more intuitive and far more accurate than you think. The learning curve is not steep and combos are relatively easy to perform. Although you find yourself moving your arms constantly, this is not a game that makes you sore in the least, or tires you out.
For the most part, your basic attack is executed by an up and down waggle of the wii-mote. Continuing to waggle in the proper rhythm will allow you to perform impressive combos. If your rhythm is perfect, you can get a "Cool Combo" which is needed for unlocking costumes, and killing special monsters which drop useful amulets.
This is the aspect that is most difficult to master. You should also get familiar with the various alternative attacks, the special moves, etc. These are relatively simple to perform with a bit of practice. Special attacks couldn't be more simple: just hold the 1 button as you waggle your wiimote. Altternative attacks, like the wind combo and heart rip can be performed by waggling up and down 3 times in proper succession, and then, break the combo with a sideways waggle (for the wind slice attack combo), or thrust forward once (for the heart rip, which primarily works on mudmen).
You can also taunt enemies, which makes them temporarily more aggressive, more powerful, and more difficult to kill. Why would you do this? For an experience bonus! You can get experience to level up. With each level you'll get some attribute points which you can distribute among four stats (Vitality, Strength, Skill, and Reach).
Pressing the B button cleans the blood off your sword. This is important to remember, as if you fail to clean the blood off of it and your sword is too bloodstained, it will get stuck in your enemies and you will be exposed to attacks for a few seconds.
There's also a great locking mechanism toggled with the press of a nunchuck shoulder button. Overall, the controls are solid and unique, and definitely add more than they detract.
However, you will realize after a while that the gameplay is actually very shallow. This may bother you, and maybe it won't.
Also, the more bloodsoaked your body becomes with the blood of your enemies, the closer you get to going into a blood-drunk frenzy which looks and feels similar to going super saiyan in a DBZ game. The kicker is, however, that the longer you remain in this mode, the more your life drips away. You can heal yourself of this effect only by using Goddess Statues and Goddess Statue Fragments, but if you have a Bloody Heart, you can heal yourself while in this mode pretty easily.
That brings me to items... There are a lot of items you can just pick up. Most deal with increasing power, health, speed, etc. Some bring you closer to your bloodlust mode, others take you away from that mode.
When you kill monsters you will get little orbs. Most of these will be yellow. These are experience orbs. Some are bigger than others, for reasons I'm sure you can figure out.

Part 2 - Technical Aspects
The game runs smoothly, load times are super short, and there are no bugs that I've run into. Technically this game is well put together. I'm not saying it's a technical masterpiece, but you must have been looking if you noticed any bugs.

Part 3 - Modes, Extras, and Unlockables
There is a story mode that can be played through on multiple difficulties. As per the norm, beating the story mode once on any given difficulty unlocks the next most difficult difficulty. There are five difficulties: Easy, Normal, Hard, Violent, Berserk.
You can also play other game modes, such as a survival mode that is what its name implies, and a free play mode, which is simply choosing whichever level in story mode you have unlocked and playing through the level again with two characters instead of one, also attempting to unlock achievements (which will unlock costumes). This mode is also useful for increasing one's level quickly.
Unlockables range from costumes (each girly has 4-5 costumes, 3-4 of which are unlockable), wallpapers, character models, music, art, difficulties, view mode, amulets (special equipment), etc. There is plenty to do, but few will probably take the time to do it all since the game does get old.
In addition to these game modes, free play can be done in co-op, although I don't believe there is wi-fi capability of any kind. This adds a lot to the enjoyment of the game just when you think you're getting bored with it.

Part 4 - Comparisons to other games (GoW, DMC, DoAX, DW, Shinobi)
Devil May Cry - You've got a similar combo system, similar flashy fighting styles, the same sort of orbs lying around everywhere, etc. It definitely draws from DMC as an influence.
Dead or Alive Xtreme - Need I say it? The girls in schoolgirl outfits, bikinis, and other risque (but rarely risque enough) attire betrays an obvious art style inspiration.
Dynasty Warriors - Onechanbara is a crowd killing game. You are constantly surrounded by mobs of monsters popping up everywhere which you must then kill. The number of zombies is massive, and dispatching them rings of DW.
Shinobi - Primarily I am pointing out that the protagonist of the Shinobi game for the PS2 had a blood related curse that would kill him. I believe in that game, if he didn't kill enough then his sword would kill him. In Onechanbara, if you kill too many, the curse will consume you and slowly drain your life until you clear the level or find a Goddess Statue.

Part 5 - Story
I honestly have no idea what the story is about, but I don't think it matters. If you care enough to watch every cutscene in story mode and read every annoying scrolling text before each level, then you'd probably have a pretty slick idea of what's going on. As it stands, however, I have never heard of someone who wanted to subject themselves to that, and it's quite obvious that the story is only there to set up the premise. Every moment relating to story is skippable with zero exceptions. If you care enough, it's there, but no one does care. While the storytelling behind this game isn't as strong as other titles, it just doesn't have to be. Adding a coherent, intelligent story would take away from the mindless mayhem and simple control scheme. The lack of a good story works in this game's favor.

Part 6 - Music
Music is all cheezy yesteryear horror music that reminds me a little of House of the Dead 2, but a tad more modern and fast-paced. The music is busy, fun, but never catchy, but once again, it doesn't need to be. It's entertaining, never annoying, when you hear it, and it isn't a crime that it doesn't stick with you when it's gone. It won't win soundtrack of the year, but I'd listen to it on MP3 if I had it. It's pretty enjoyable.

Part 7 - Graphics
Graphics are solid enough for a Wii title, but wouldn't impress anyone in the grand scheme of gaming graphics. What is impressive is that probably 100 zombies can easily fit on the screen without any slowdown, and there are many many different kinds of zombies and different models for the basic zombies. Bloodspray is satisfying and plentiful. Dismemberment is great.

Conlusion:
The game is solid, simple fun on the Wii and deserves an easy 7.5, but is hurt by the fact that the combat system could be better, and level layouts are uninspired and often recycled. Playing through the game on different difficulties and with different characters, going for all the achievements and unlockables is loads of fun for a while, but eventually it becomes boring. The game could've done with a third fighting stance per character, weapons that could be picked up and used for more variation, and a few more cinematics. Also, the unlockable costumes should be MORE skimpy, never less. Of course, level design needs work too, but actually it's not that bad. If I could fix anything with that I'd just add a little more variation.
This game was never looking to be Devil May Cry 5 or God of War 4. It wasn't trying to redefine the genre. it was trying to make a budget title with loads of content, some replayability, and amusing single player and multiplayer, all wrapped around hot girls. Success.