I saw LZ in '76 and loved em.
Although Plant's voice is a little worse for wear they sound better here.
Well, that too. But it was also the giant stage shows, 20 minute meandering guitar solos, pretentious lyrics etc. Punk/new wave got back to bands with simple or no stage show playing 3 minute songs. It was about bringing back the earlier energy and simplicity and the feeling that anyone could do it that seemed to be lost in the era of stadium rock.