Well, finally played a Wii last night. Was about like I expected (wasn't impressed really at all). I think I was irritating my friend's fiancee because I wasn't standing up and swinging my arms, just flicked my wrist while sitting there (and was doing as good as them). The Wii sports games are really simple (I can't believe they act like giving that away free is a great deal, as I would pay maybe $5 for it).
So basically, yeah, I won't be buying a Wii until Smash Bros. comes out and even then, there's good chance I still won't. They could easily do everything the Wii is capable of with a specially designed controller for the 360 or PS3 (and the games would benefit from the better presentation as well).
Don't get me wrong, its ok (although I think its overpriced for what it is), but for me personally the novelty just isn't there at all.