See, I really like a lot of "audio mud," as long as there's some melody buried under it. Besides Nirvana, one of my favorite bands from back in the day was Dinosaur Jr. J Mascis was a master of putting together some wonderful melodies, but burying them under layers and layers of noise and feedback and distortion.
http://www.youtube.com/watch?v=6XBIfOFtmmM
So much of this music is pretentious as ****, but that's true of most rock anyway.
Pavement's a band of the same basic vintage that I've gotten into recently (knew about them, but never really listened to them back when I was younger). Same kind of deal, although I think they hold up a little better over the years.