My proggy friends love Deliverance, even though I hate it. Damnation is probably my favorite album as a whole but...
Maybe I'm the only one, but usually on every Opeth album there's 2-3, sometimes 3-4 songs I listen to. In each album there's something I like... and it's really the difference between albums, because of personnel, musical evolution, whatever, that makes every subsequent album worth listening to in order to find the songs I like. Maybe on Ghost Reveries I dislike half the songs, and half of My Arms, Your Hearse bore me, but the half I do like... I love.
I'll tell you this: even though Morningrise is my favorite of their "metal" albums, the biggest knock on them during the Morningrise / Orchid period is that the sound on the two albums is so similar. Change is a good thing. And their musicianship is just outstanding, and that's one aspect of their discography that improves tremendously on the newer albums. Ghost Reveries is, if anything, an album that definitely is the product of much love and dedication.