JPS< I agree with some of that, I certainly agree there was a lot of bad music made in most every era, but I just don't find many things I like from the last 15 years or so, but that is probably me to some lesser or greater extent, like our taste in cars, I think our taste in music sort of gets more hard coded in, or the pleasure centers in the brain become a little harder to stimulate just right or something, and it gets harder to feel the "I love it feeling" towards newer stuff as we go through life, not impossible, but it happens less often. Just like there are lots of cars from the 60s that I positively drool over, and certainly a few new designs I like, but not near as many, and most look like slab sided behemoths to me, judging from what I read on the forum I am not alone in that feeling.
There are tastes and styles that come and go in the music as well, and that is some of it for me, even though I can find stuff I like from the eras, the mid to late 70s were not my favorite for music with disco, nor was the mid to late 80s with hair band metal. I don't know if you can really define everything in the 2000s as anything other than "eclectic" the internet changed everything, so much easier to produce and market music so no one thing dominates the airwaves, which in fact aren't what they used to be either. My 28 year old son is very heavy into music, and I like his taste, he likes much of the old stuff I do, but I am quite sure he doesn't feel newer stuff is any worse. I noticed he doesn't listen to the radio at all, gets it all streamed or downloaded over the internet, years ago I told him we learned about new songs and artists as we heard them on the radio (or sometimes even TV, Saturday Night Live, Ed Sullivan, remember "the midnight special" and of course "American Bandstand"). Anyway, that is not how the new generation is exposed to new artists (for the most part).
Getting back to your comments maybe there is more bad now because it doesn't have the major market commercial filter (i.e. battle to get airplay on the local AM station, even though ironically us progressive alternative music types thought this was evil) it all gets out there on iTunes and what not.