Not just for Dragonball fans.
In Adventure Mode the first level functions as a tutorial, showing you how to play the game. The further your progress the trickier (though never too tricky) the foes become. I especially liked the the mini and big bosses you get to fight. They all have their own fighting styles and routines that change as you deplete their healthmeter.
Basically you're playing through the early Dragonball history with the Red Ribbon Army, the first tournament and Piccolo.
There is also a Tournament Mode, where you get to play against some of the other characters. Depening on what you unlocked in Adventure Mode you have different characters to chose from. The Tournament Mode is not very fun. There are better fighting games for the Wii than this one.
Good replay value in the Adventure Mode, as you can revisit every single stage you played and try to get the highest score and unlock characters for Tournament Mode.
Adventure Mode is fun, been playing that a few times. Tournament Mode is boring. Hardly played that.