Fuck Rockband, Guitar hero World Tour rocks my face off.
I played it today when I was at a mall and hiding from work. It didn't impress. I liked playing Hotel California, but the graphics and the experience with RockBand is head, shoulders and ass above GHIV.
BTW, RockBand just scored a deal to have Beatles songs on there next year. In November, RB releases an 18-song AC/DC pack. Can't beat that.