yeah, it's really a game to be played in moderation. Especially if you've played the previous DBZ games, you wont get anything new here. There's a lot of stuff that seems too familiar to the other DBZ games that makes me feel like I'm just replaying the same game.
However the graphics are great, voice acting is great, and the gameplay is fun. I have it on the Wii, and the controls on that system are reaaaaally hard to get the hang of at first.