Yes, Supertramp was over-produced as was ELO and others like Styx. Although, I liked them at the time, I never listen to them anymore even though I have the CD’s. Agree that The Clash and was raw like a garage band. They kinda held my interest for awhile.
Wrong. Punk came out of the NY music scene (think CBGB niteclub) in the mid 70's and quickly spread to England. The New York Dolls, Ramones, Sex Pistols, Clash, etc were around in the mid to late 70's. They pretty much died out in the early 80's with the big hair bands and the single hit wonders.
Personally, I think the 80's was the best era for melodic rock, not counting 60's Motown and the like. I have 8 cd's off hits from that decade and they sound as good now as they did then. Some early 90's was also good. Since then - regurgitated rock and pop flash. Boring.