DH has a Wii.
DD is nearly 3 and has had one go at a little kids game. She is not yet coordinated enough to do it properly but probably will be in 6 months time.
DS is nearly 5 and plays from time to time, couple of times a month. Loves it.
It IS a good family computer game but agree with what many other people are saying: Buy it for yourselves not for your DD.