This game is ok, the routines are decent and and it's not as childish as you would imagine.
The problem is with the remote and nunchuk. It would work quite well with a wireless nunchuk but with the regular one the wire gets in the way, hits you in the face and you can't always replicate the moves accurately, thus losing points.
I have the wii balance board and, although you can play without it, it does make the game more interesting. Also, the female coach, with her squeaky, over-enthusiastic voice, does get quite annoying.
The routines are quite easy to learn, and although it is geared towards young teens, I enjoy playing it and I'm 21!
All in all not bad but is definately better with a wireless nunchuk and the balance board.
P.S. I agree with other reviewers... Wii Cheer is way better!