Don't Buy This Game
This game (and it's movie counterpart) try to play off of nostalgia. The problem is that this game will kill all of your childhood memories and leave you haunted with nightmares of a wasted childhood. It is by far one of the worst games ever made, if not the worst. If you are considering purchasing this game, you should watch this video first. To put it bluntly, this game makes E.T . look good. It plays better in still images than in actual gameplay, and makes you hate yourself for spending money on it.
In the story, you are Goku, a normal white (not asian!?) kid who goes to High School (High School High?). You are learning martial arts from your grandfather. Turns out your grandfather has something, and Piccolo wants it. After some entertaining still picture fighting, you go up against him in combat. Chaos ensues, and Goku has to save the world.
As far as combat goes, it is incredibly mashy, only requiring you to push Square. You CAN pull off moves, but it is decidedly not worth trying to learn it, since the combat is the worst part of the game. You will play as more than just Goku in the story, but whether or not you will actually recognize who these people are depends entirely upon your imagination.
There is multiplayer and an arcade mode, but both of those feature the combat. You choose between 10 characters and fight it out. Since this features the combat, you should avoid this part of the game. If it were pictures fighting each other, that might actually be fun, but only for comical purposes.
Dragonball: Evolution is considered by many to be the worst video game of all time. It is only fitting, as many people found the movie to be one of the worst films of all time. My advice to you: do not buy this game. Do not support this in any way. You will only encourage them to pump out more F-Grade games. If you are dying to get your hands on this game, you are a masochist. Don't buy this game.