I have a really small crappy old TV and the Wii is still awesome. In fact, the Wii is so good that I've decided my next big purchase will probably be a big TV, to make the Wii experience even better.

Anyway, the best game for the Wii is, hands down, Wario Ware: Smooth Moves. Well, for multi-player, anyway. But finding other people to play with is easy, because everyone loves the Wii, even people that don't like video games in general.