All the other reviews are way too harsh! This game will be an instant classic for the Wii, and should never be passed.
The story is about Mickey, who went through a mirror and found himself in Yen Sid's workshop. Yen Sid was putting the finishing touches on his newest creation, a world for forgotten Disney characters. When Yen Sid decided to go to bed, Mickey got on the chair and tried to paint an attraction on the world, turning it into an ink-y monster. Mickey tried to erase it with thinner, but he spilled paint and thinner all over the world. When Yen Sid came back to the workshop to see what had happened, Mickey had left and his creation was ruined. After Mickey became famous, the Blot grabbed Mickey through the mirror and dragged him to the Forgotten World, Wasteland. Mickey grabbed Yen Sid's magic brush and fell in.
You have many things you can do in Epic Mickey, you can shoot Paint and Thinner. Paint restores things erased by thinner and thinner erased things restored by paint. You can jump, double jump, and even to a spin attack.
Enemies are quite interesting to kill, either thin them out with thinner, or befriend them with paint. Hitting enemies stuns them, and you can hit him of the edge of a cliff or into pools of thinner.
The camera is truly awful, I often died at boss fights by falling of the edge. You either can't see behind you, or your camera shows Mickey VERY far away.
You can get more paint or thinner depending on how you beat a boss, and this is a problem, the game SHOULD ask you what you want to increase, but instead, it increases one of them depending on how you beat a boss, and because of that, I have A LOT of thinner and little paint. Most of the bosses, your instinct is to use thinner, like the first boss, Clocktower, I thinned out his arms, because I couldn't find a way to use paint, the second boss, PeteRonic, is easy to see that you can use paint, and the 3rd boss, Captain Hook, the only way to BEAT him is to use thinner, but saving the fairy (which I didn't do) gives you paint.
The levels are boring and easy at first, but then get challenging and fun, but then it goes to boring and hard.
Although this game is not perfection, it still is amazing, and I think you should buy it.