hard to say. the only 2 bands that have perfect albums in my book are the Grateful Dead and Television. close seconds would be Talking Heads, The Beatles, Nirvana, The Pixies, The Smiths, Suede, etc.
edit: forgot about In The Court of the Crimson King; i would say that one is all 5 stars. so that would mean, going by the numbers, Grateful Dead, Television, and King Crimson. but in the end i probably get more enjoyment from slightly less than perfect albums and overall discographies so i don't know how i would answer heh.