To me, a "perfect album" is one with nothing but strong songs, no weak links, highly listenable, that takes the listener on a complete journey. Greatest Hits compilations don't count. There aren't many, in my opinion. Here are a few:
Hard Band Fe Dead - The Toasters
Lincoln - They Might Be Giants
Led Zeppelin II - Led Zeppelin
Tragic Kingdom - No Doubt
American Idiot - Green Day
I love The Beatles, Michael Jackson, Jackson Browne and Queen, but there's something about each of their albums that keeps them short of "perfection."