Yeah, it's funny this came up because a few weeks ago me and a few friends got baked and listened to it, and the general concensus was "I remember this being a lot more fun when I was 16."
I like their earlier stuff most. Piper is a pretty good record. Saucerful of Secrets, Ummagumma, Atom Heart Mother (my fave), Dark Side, Meddle. I also found Wish You Were Here more boring than I recall. I think that used to be my favorite, but now, it seems too spaced out and I'm more of a concision guy these days. With that said, Animals has held up well enough, although the long songs did bug me.