Styx.
My first album was a Styx album. The only thing I can come close to hearing from them now is Mr. Roboto if I've first had a few beers and that is only because it is so ridiculously cheesy
Devo is another band from that era that sounds crazy lame when I hear any of their stuff now.
I'm going to pitch out Led Zepplin, certainly to the chagrin of many. Some of their wizzardy, lord of the ringsy stuff just sounds stupid, while other songs have held up great and still other songs had me reaching to change the station from the first moment I heard 'em.
I'm ashamed to say that I used to really enjoy The Mentors....even saw them in concert once....what a sad and confused young man I must have been.