Stay away!
I went downstairs, popped it in, and came up thirty minutes later with the game beaten. I was disappointed and couldn't say anything about it because my uncle bought it for me. (I have a VERY controlling conscience.) The game had bad controls, bad graphics (but you could expect that from the Wii), and overall, it just wasn't very fun. You can unlock all the characters by playing through the story mode on easy difficulty, but to beat most of the challenges you have to beat the game on a harder difficulty which is a waste of time and very frustrating.
I strongly advise you to not buy this game because it is flat out horrible, but if you don't believe me go ahead and rent it, but don't say I didn't warn you.