Everyone seems to be listing their favorite albums, but the topic is PERFECT albums. To me, a perfect album is one that has nothing but great songs, a very, VERY elusive beast. I'm not entirely sure one exists. (MAYBE Thriller, but that's not really my kind of music.)
I mean, Mellon Collie and the Infinite Sadness is one of my favorite albums, but more than half of it is filler. And, as much as I like Faith No More and Mr. Bungle, neither has made a perfect album. Cuckoo for Caca and Ugly in the Morning come to mind as sub-par songs from King For A Day... for example. Jizzlobber and Malpractice on Angel Dust are just fucking awful. And the Beatles' "white album" is the very definition of self-indulgence.
I'm just touching on some music that's been mentioned that I'm most familiar with, but I'm sure it's pretty much the same with almost everything else that's been mentioned.