I like all of Opeth's albums, although I think they really started to improve when Martin Lopez joined the band. Orchid and Morningrise are good albums, don't get me wrong, but the production values were also kind of full. Then My Arms, Your Hearse sounded so much better and Lopez, man, for a guy who plays a little bit too far in the pocket sometimes, I really always liked his style (even though I like the new guy even better)
I've been on a serious Opeth and Dream Theater kick lately, going through their back catalogs. I had forgotten how much I really liked those early Opeth albums.
And the new one is brilliant, but I think it's almost like a different band now.