Queen wasn't even on Guitar Hero II (Well, unless you got downloaded it on the 360), Nomyt. There just aren't that many good songs by Queen that would make good Guitar Hero songs.
And I actually find out more about the more modern bands thanks to GH.

Luckily, I have gotten a bit into AFI.
Oh, anyway, Career mode seems a bit shorter, yes, but that's until you hit set 8 (DAMN YOU, RAINING BLOOD). It's just a matter of playing other songs over and over again just because they're fun (Rock You Like a Hurricane, anyone?).
For the record, Slash > You.