It's great if those songs are good in themselves, but I think there's something to be said about songs of the same quality having cohesion. It sort of makes the album - as the cliche goes - "much greater than the sum of its parts."
Most music is built off of a certain amount of repetition at the song level, so it's interesting to see that done properly on the scale of an entire album.
In that respect, what albums do you feel satisfy an exceptional level of cohesiveness it its songs? Of course, please do explain why.
For starters, I will mention () by Sigur Ros as one such album. From the the album and the songs having no titles and the same meaningless lyrics being repeated over and over again, there's a certain tie that binds the album. And musically, it feels as if one big piece divided into two halves of four movements each. Sigur Ros' discography as a whole is already more cohesive that most popular albums, but this album of theirs takes that quality to a higher level.