The best aspects of the game are the soundtrack and the gameplay. The combo system in the game is pretty easy, but the gameplay itself is pretty solid and plays a lot like No More Heroes. The soundtrack ranges from punk to viking death metal to that cheerleading song about that dude Mickey. You know the one.
The bad is probably how short the game is, but for me the levels never seem to get old whenever I play them. Replayability just depends on how much you enjoy it.