I view this album as a sure sign of disintegration. That might make it essential as a curiosity but it doesn't make it much of an album. Actually as Harrison having more space as the Lennon and Macca collaboration fell apart. The guitar solo in Come Together actually sounds like Harrison has been left to it, very louche, as if nobody else was there, it changes the tone of the song. The up side are his two songs which are wonderful classics, which make me wonder what the Beatles would be if he had been a third powerful voice all along. His nature seems less pushy than that.
Those two novelty songs and all those part songs at the end don't help this seem less of a powerful offering. Compare it with Magical Mystery Tour which comes out right after Sgt Pepper is thrown together as a concept and is still packed with instant hits and some of the great songs and it looks weak.
All that's left is I Want You which as oldkid mentioned is Pink Floyd like it gave them the idea to be Pink Floyd. Im not accusing the Beatles of the crime of inventing prog rock. They probably got the idea from Cream.