The thing with GH is that Gh3 lost it's feel. If we're talking GH3 and RB, RB. If ANY game, GH2 takes the gold. Gave an experience no other game could.
But sadly, I am losing interest in GH games. I've 5-starred all expert songs on 80's, just have Psychobilly Freakout and Jordan on GH2 (360) and GH3 just has Raining Blood and TTFAT for me. I like Rock Band as I like it when they release new songs weekly. Gives me more songs to play, I would play the same three songs on GH2 and 3 for two hours, versuses the RB play of two hours working on a mass amount of song.
I think GH3 was just above 80's, but heck, new developers, I give em a break. GH2 hands down was the best before RB DLC began to pile up.