Rock Band is a lot of fun.
My only bitch with it is that the drum kit bears as much relationship to a REAL drum kit as the guitar does to a real guitar.
...and if they REALLY wanted to up the ante, they'd have provided a high hat pedal too! {grin}

BTW... have you mucked about with the Open Source Version (http://fretsonfire.sourceforge.net/) of Guitar Hero?

--MAB