It was released as a double EP in the UK. I see it as an album. It's definitely more of an album than Yellow Submarine.

If we are going to judge it strictly as the UK EP release then you can only rate it based on the following tracks:

Magical Mystery Tour
Your Mother Should Know
I Am The Walrus
The Fool On The Hill
Flying
Blue Jay Way

Those 6 songs don't merit being listed with the titans of the Beatles album catalog.

Tough one. Two of the best albums ever made.
Today I feel like Revolver is the better one.

Beatles For Sale is probably my favorite to listen to start to finish.

And truth be told, Tomorrow Never Knows is utter crap!

I thought Revolver would be running away with this, but good to see Sgt Pepper in a dead heat with it - to be honest, it sums up both albums in that it you can't really choose between them. For me, at least today, it is Sgt Pepper. It just has more of a thematic and thus coherent feel to it. It's still the greatest concept album ever made, and although people argue it stops becoming a concept from the third track onwards, I disagree. Although there are no seemingly relevant characters after Sgt Pepper and Billy Shears, the music maintains a concept in line with North of England carnival like music hall (aside from Within You Without You).

My personal feeing is that if you dropped acid in the Edwardian or Victorian era, then this album would be what was going on in your head. By saying that, it lets your imagination run wild and takes you on a journey - its a legal high basically! It's surreal yet its imagery still maintains its roots in the culture and environment John and Paul were brought up in. That's probably no coincidence since the original intention of the album was meant to be about Liverpool, so the old tropes and familiarities of 'North of England way' are still present in the album.

I've always favoured albums that have a sense of identity and belonging to the environments and culture which artists are a product of (see Definitely Maybe, The Smiths, Sigur Ros, numerous albums by Bob Dylan and Springsteen). But this one is the most unique - it doesn't just directly refer to the archaic forms of music that are part of Liverpool's heritage, instead it completely turns it on its head dragging them into the psychedelic 60s in all its technicolor glory! It's probably the most original Beatles album in my opinion, but the greatness of The Beatles lies in the subjectivity of it all!