Well, I can't really say about GH 2 myself (my copy of the 360 one comes in today actually), but I was just reiterating what my other friends have said, and they play both games quite a bit (although 2 more because they made it quite harder than the first one).
But about 1, the only ones I'd keep from that list is the Boston, Queen, Megadeth, Hendrix, Blue Oyster Cult, Vaughan, Edgar Winter Group, Pantera, Ozzy Osbourne, Graveyard BBQ, and Freezepop songs, and also the Judas Priest song. The others got boring fast or just didn't have enjoyable patterns to match the song itself - my friends who have the game are all in agreement, and most don't even really talk to each other (of those who have the games of course). But seeing those songs, that's only 12 of 40 songs? I'm not even saying my thoughts of those songs I kept, because I don't think highly of a few of them, but I enjoy playing them, just as I enjoyed playing Elite Beat Agents.