I just rented it, and got through maybe 20% of the game. It's fun, however i'm glad i rented it and didnt buy it. Its a shorter game, and the graphics are great. Gameplay is fun, and their is some good bosses, however going on a killing spree just gets a little boring after a while. It's basically like Mortal Kombat with its fatalities, and your killing until you reach a score to reach the boss. The worlds are cool, but their small. I think bigger worlds would help break up the game a little bit, so its not quite so violent, and a little more a action game.
Soundtrack is good too. So there is some def. pluses to the game. I want to checkout the multiplayer mode too. That could be fun.