I always kind of felt like just because you make songs longer and louder doesn't mean they are necessarily better. To me, the 70's (particularly the early 70's) were very bloated. I further think rock music was rescued from itself later in the decade with punk, etc.
I'm not against some pre-"Wish You Were Here" Floyd or some 'mid period' Stones w/Mick Taylor.. nor more than the next guy. But a lot of the music from that era is bloated and lame.
Whenever it gets big and bloated.. I just dive back into early to mid 50's Sun and Chess stuff and I'm saved.
I suppose that a lot of this is subjective, but you can't criticize Led Zeppelin, Steely Dan or The Who for that.
It was also the golden age of southern rock with the Almans, Skynyrd, The Outlaws, Little Feat and Marshall Tucker.
I liked the Clash and a lot of the New Wave stuff at the time, but not as much now. It's not as good musically, some of it is mean-spirited, and a lot is just vapid.