So last night I was taking a trip down memory lane listening too:
Fleetwood Mac Rumors
Eagles Hotel California
Steely Dan Aja
Van Halen Van Halen
To me classics like these, and I'm sure there are many more, and no I'm not forgetting DSOTM , just seemed to have never been topped by any music since then.
I can't think of any "new" music that I've bought in the last 20 years that come even close to matching the "greatness" of the 70' and 80's rock.