I think music continues to be on the same level of quality (for the most part). Radio top hits generally don't last and become forgotten. As another poster said, it's just fluff.
And of course people of a generation love their music more. I still love Nirvana, Korn, Sevendust. Yet I appreciate the newer and the older generations of rock/metal. Metallica, Pantera, Dio, Zep and Skynyrd. They are all great to listen to but my tastes of right now have been moved back to the Nu Metal era and the new stuff.
Chevelle is meh for me. I'm partially biased as I cannot stand radio rock, it's too fluffed. Though I believe Alter Bridge is the best modern hard rock (radio rack) in a long time.
It's funny how we mention in the older days you listened to the entire album. Sure, I can listen to the entire discography of Zep and Skynyrd. But I certainly cannot listen to whole albums pushed by top radio artists of those times or today. They are one-hit-wonders.
I have a very picky taste in metal, not like any other genre I listen to. The only modern metal band I can listen to from album to album is Trivium.
Everyone has their own tastes. I cannot stand 80s hair metal bands (the glamour bands), I think that was truly the lowest point in rock history and wish Scorpion, Poison, Motley Crew, Quiet Riot and Twisted Sister, to just name a few, would be exiled from the radios JMO.