Of course SOME good stuff came out of the 80s, but its common knowledge the golden age of rock and roll was in the 60s and into the 70s, and in a game like Guitar Hero thats what really counts. Im sorry but in terms of what i would want to play:
Rolling Stones, Doors, Zepplin, and The Who > Twisted Sister, Poison, Skid Row, and Guns and Roses
There is no comparison. Anyone i know would say that it would be fun to play the 80s stuff on GH, but they instantly would say that it would rock so much harder to play the good stuff. And in GH rocking is the whole point.
Edit: And Grey, thats why all the new music ive heard next to Wolfmother and RHCP is crap IMO.