Check your bargain bin.
Graphics : The game uses the unreal engine, wich I'm not very fond of. Loads of blurry textures, pop in and such, and Ninja Blade isn't an exception. While the game looks reasonable, it has some very, very bad artistic design. Everything is super bland, enemies are very uninspired and whenever you do a platforming animation, your character gets blurred out with a blue aura, wich makes it impossible to see the action he performs, you just see where he's headed to, even if the character animates well on the ground.
Gameplay : The game has loads of cool looking weapon fighting animations wich doesnt do justice to the game itself. Everything is slightly jitterish and unpolished. See, its very hard to see when to block, because of all the shiny particle effects when you hit an enemy, wich forces you to turn the game into a button masher and cancels the use of the dual short-swords ( wich doesnt knock the enemy's attack ). The platforming is reasonable, yet unneeded. It's just an excuse to go from a battle platform to another. The heavy emphasis on the QTE's is fun for a while, but it quickly gets tedious, most likely due to the poor design of everything. You'll basicaly see Ken stab, dodge and jump a lot. That's about it.
Sound : Very uneven. While the game intro has a solid, serious and sad theme, and ironicaly the game doesnt take itself seriously. The voice acting is a mixed bag between japanese and english, wich can be confusing without subtitles.
In the end, Ninja Blade could have been a lot more if the whole game wasnt as bland. Tokyo rooftops or underground caves/subway stations is vastly uninspired, and the gigantic mites/scarabs/snails/snakes/spiders/worms you'll kill aren't very good looking or convincing. The whole thing is just brought down by the game's design, wich is as good as the cover art and the character font. Bland. Wich describes the game. While not a terrible game, it doesnt bring anything new to the genre.