I don't understand why so many people like Blackwater Park the least of Opeth's seven. BWP is either my second or third favorite by Opeth; a toss up between it and My Arms, Your Hearse, following Morningrise.
I think that "The Drapery Falls" might be my favorite Opeth song. It is difficult to make a final selection but I know that whenever I hear that song, I melt. Mikael puts so much emotion into his non-growl screams and backed by amazing lyrics, as usual.
"Bleak" is a good song as well. It is a song about a man then attempted to take her life. While killing her, he sees his reflection in a pendant realizing that he isn't human.
"Blackwater Park" is a heavy song with excellent accoustics and soft sequences. I can't say that it is the worst BWP song.
Don't get me wrong, I love the song The Leper Affinity a lot, but it is the worst song on BWP...