Erm, GH2 was the best one
Each to their own mate.

Personally i didnt think GH was anywhere near polished enough, with a decent enough tracklist till Legends of Rock came out. And after that it was just hit and miss.
I actually don't mind the Warriors of Rock tracklist, it's good for the metalheads like myself. Atleast half the songs listed should be fun to play, but i don't think that list is complete yet. I read somewhere that there is supposed to be something like 90 songs, but the rest of them could be crappy bonus songs that nobody has ever heard of.