I tried the game at Best Buy. It's really silly if you already know how to play guitar. In fact, it seems very counter-intuitive if you already know how to play guitar. Witness me trying to play "Surrender" by Cheap Trick on Guitar Hero, a song I've jammed on numerous times. Hell, I've even been paid to play that song. But can I play it on this stoopid game? Of course not.
Feh. I'll stick to playing for actual audiences in bars and clubs...not in my living room.