Oooh, a Guitar Hero thread! This is my kind of deal right here, and I am VERY eagerly awaiting part III. I play and love GH1, GH2, and GH80's, although I'm horrible at GH1 because of the crappy hammeron-pulloff system. I even bought a 360 just for the 360 version of GH2, although thanks to DLC, and other good 360 games, I don't regret that at all.
I should also plug www.scorehero.com, if you all don't already know about it, as it kicks the ass of the official forums, and GameFAQs forums. It also is a score tracking/ranking site.
If anyone cares at all, http://www.scorehero.com/scores.php?user=7219&game=3&diff=4 are my scores for 360 GH2. My 80's scores are there too, but I don't play that as much, as well as the PS2 GH2, but I haven't played that since April 3rd.