You know, I didn't post that LSD ruined Sgt. Pepper, because I didn't think anyone would agree. But the song completely breaks the mood. I guess it was more an experiment in psychodelia than anything else, though. As a single, it's not so bad, but it doesn't belong on the album.
I also think that "Octopuses Garden" was a great track. As to the other Beatles songs being criticized-- We have to remember that, though they were an amazing progressive rock band, the Beatles were, first and foremost, a Pop-rock band. While they chose to experiment, they still tried to stick to their roots.
As to an album that is completely perfect:
I know this band has gotten a lot of flack around here, and I'm not saying that they are the best band ever, or even that the album is all that influential or progressive, but it IS the best flowing, most consistent, best mood-keeping album I've heard in a long time:
TMBG-"Flood"
I'd also like to bring to the table Pearl Jam's "Ten" and Green Day's "Dookie" as good "flow" albums that also completely rock.