Being intrigued by some of your views on "Sorceress", I gave it a proper listen with
lyrics in front of me
side note: genius.com is a great site for lyrics with dynamic side notes - end of side note
I liked it from the beginning, never seemed "boring" to me, but now I love it.
You'll find coherency and purpose if you give it the proper attention. Lyrics and the cover art helps a lot. The Peacock feasting on the dead, expresses the duplicity of evil behind beauty. It's feathers also resonate with exotic motifs of the Middle East, a lot of the tracks combine exotic with bitter and evil, like in a mysterious fairy tale. It's not a concept album in the classic sense but the tracks are definitely linked.
Also some of online reviews and interviews confirmed links with Black Sabbath and Jethro Tull, influences that were clear to me from the first listen. Loving those two bands I can't help but love this album. The album is magical and powerful.
And this is pure poetry: http://genius.com/Opeth-a-fleeting-glance-lyrics
Also I'm beginning to get the production style. Heavy bass and distort help on those specific tracks and mellower tracks are clear and clean. It's not mindless compression.