A.F.
J.,
we bought a wii for the family, last Christmas.
My 11 and 8 year old quickly moved on to playing only more traditional video games. After spending the $ for the base system, I was reluctant to by the balance board and other remotes, etc. needed to play the more active games. The one exception is we found Guitar Hero, used, and they will use that game with friends (extra remotes needed!)
Still, they end up sitting down to play golf and tennis!!!!
For a 3year old, I would put off the video games and use the money to buy a family pass to the local rec center!!
good luck, A.