Rock Band - Awesomest Game of E3

Honestly. Just... Honestly.
How awesome is this game gonna be? I mean, yes, it will undoubtedly be very expensive. But when I see videos of this game being played, I have visions of playing the game in front of a live audience as a real rock band.
How fun is this gonna be.
And I know some of you think a game like this is lame just because everyone else likes it, and to you, Jake, I say that *you* sir, are the lame one.