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To be honest, if you were at shows back in the 60s and 70s, you probably have no memory of the comparative sound quality. I don’t, anyway, though I remember a bunch of other stuff!
I just think that any concert in any open stadium sucks big time soundwise. I dislike it so much that I decided a long time ago not to go to Stones stadium shows anymore, so I even skipped the last tour's Amsterdam Arena shows, which were like 15 minutes from where I live. I went to see them at the London Olympic, but I left during Rambler.
Best sound of any open air shows probably was the Berlin Waldbuhne, which was so clean and loud it was fantastic. Indoor shows the Olympia was incomparable, brilliant sound. London O2 was great, but Arnhem Netherlands sucked.