Not the greatest game out there but it's got potential.
This is a game where you hack, slash, and gun your way through each level to progress. In addition at the end of every level you gain experience points that are applied to your characters, when you reach a level you are given points to distribute into various traits of your characters (Skill, Agility, Health, etc). Essentially it is something like a "lite" version of games like Dynasty Warriors and similar hack and slash titles.
The game seems to be a bit more steep in scale than most I've played from such a genre. Case in point, I have played the entire game through Easy and reached around level 37 with the main character. When I played through Normal, I ran into difficulty killing the boss on Chapter 7. I guess this in turn forces you to go back and progress through earlier levels to gain a bit more experience/levels before trying again.
This game is definitely not going to wow experienced players but for a casual gamer it is worth a romp or two. When I first bought the game I played it for a few Chapters then put it down. It wasn't until months later that I invested time in it and started into it again to finish through Easy.
Through the Chapters you'll also unlock clothing, colors, and have options to purchase characters from Xbox Live. Are they worth it? Not really. It's fun for about 2 minutes. Add to the fact that the younger sister in this looks way to young to be viewing in her underwear, you're left feeling dirty attempting to dress her. Pretty much Lolicon fanserve to the pervs.
This game's fun for a run through if but to experience it's entire storyline but only the hardcore gamer would stick around to continue opening additional stuff. Definitely rent before investing much into it.
If they make a sequal to this, hopefully they'll improve the game mechanics and make it more playable.