According to Metacritic, this game is pretty good!

[Vectorferret]

A game review is only supposed to compare the game for it's target audience, against other games for that audience. A higher score doesn't mean it's better, only considered (by critics) to be better for the appropriate audience. Basically, they are saying they think kids will enjoy the game more than the snobcore will enjoy Mario Kart Wii. What's wrong with a game for kids that adults won't like having a good score when kids will enjoy it? I think this is a rare example of a Wii game being reviewed well.