Although I don't think there is a "perfect album" there are several that I consider near perfect in the fact that I can listen to the first song thru until the last with no thought of skipping one:
Roxy Music Avalon
Bryan Ferry Boys and Girls
Moody Blues First 7 albums
Beatles Magical Mystery Tour
Rolling Stones Sticky Fingers
Aftermath (US pressing)
Beggars Banquet
Boston Boston
Cars Cars
Kitaro Silk Road
Michael Hedges Aerial Boundaries
Eric Johnson Tones
And several others already mentioned
Roxy Music Avalon
Bryan Ferry Boys and Girls
Moody Blues First 7 albums
Beatles Magical Mystery Tour
Rolling Stones Sticky Fingers
Aftermath (US pressing)
Beggars Banquet
Boston Boston
Cars Cars
Kitaro Silk Road
Michael Hedges Aerial Boundaries
Eric Johnson Tones
And several others already mentioned