xkcd gets it right as always. It happened with Guitar Hero and it'll happen with Rock Band. Clue for those who say this stuff: it's fun, we have fun playing it, it's a game. Saying it's stupid because it's not like playing a real guitar is like saying UT3 is stupid because you're not really slaughtering the Necris army, or Risk is stupid because you're not really taking over the world.
Edit: And yes, LAN party post soon. Too much writing for now.