It's great on the Wii. I'm currently playing it on the Ps2 which is kinda slow, but it does work well enough. No doubt the PS3 will be awesome. But if you already have a Wii, I'd go for that.
I haven't updated this for a while, but now I can pretty much nail any of the Expert level songs. There's still a few that give me grief, but mostly I have this mastered. I'm a nerd too because I own them all 2,3,World Tour, Aerosmith, Metallica, Rock the '80s
I haven't purchased the gold-plated guitar yet..... *shiney*
Ah, and that Guitar Hero episode on South Park was just about as good as the WoW episode (still my all time favorite).