Note that some review sites get it. Read the reviews for the higher scores.
Then I went on youtube and searched for "just dance wii". Wow, people really like this game. From what I read, seems like a kareaoke machine for dancing. Just that. No unlockables. Not many modes of play. Just dance and get a grade with friends. No wonder its selling so well and I think it deserves every sale it gets.
I'm not a big kareoke fan and I'm more of a gamer so I might not like this one, but I have other dance games that I like. But I can certainly see why this game sells. I can also see the ignorance of sites like IGN. Their review is so ridiculous. Even the site that rated the game a 0/10 mentioned things about the game more than IGN did (but it still didn't count like a review that he posted why he gave that score).
Reviewers are so out of touch with reality...