Let's see ... having not grown up in the 60s, 70s, and most of the 80s it's hard for me to make an informed decision on the general music of those decades. That being said, I have a fondness for a lot of rock/pop from those eras, and New Wave is so bad it's good (the same with Disco, to a much lesser extent.)

I don't really remember "noticing" music on the radio until 1997. That being said, there were a few bands/singers that I love that came from/hit their stride in the 90s, and I don't remember there being any overwhelming amounts of bad music, so I have a fondness for the 90s.

As for the 2000s ... it seems there were some decent bands/songs out there at first (mostly from the post-grunge genre), but the decade quickly became overrun with shitty pop, rap/hip-hop, R&B, etc. At the end of it there was all that Rihanna/Lady Gaga/Black Eyed Peas shit and nothing more.

This decade is shaping up to be the worst I've ever seen in regards to music. 100.99% of the music is the shitty pop, rap, R&B, etc., the few "artists" out there that actually can sing can't write shit, and hypersexualized superficial Hollywood bullshit is the core of the shit they do write.