The twin sound is cool and actually has just recently begun to really click for me, though I immensely prefer the newer style. Some people might not see exactly where I'm coming from, but having been weaned on so much thrash, the twin lead would sound better to me if there was a third guitar that played lower notes, plam-muted, more riff based maybe, underneath the twin leads. Part of the problem is I heard Morningrise and Orchid after hearing Still Life, MYAH, and BWP, and that style was so distinct to me, and sure I could hear influences hear and there, but it seemed like a style wholly their own, with the occasional influence alluding to bands past, whereas the guitar work on the first two albums yes is unique in terms of composition and the acoustics, etc., but the twin leads do sound like a lot of things I had heard already, some Maiden, parts of Garden of Shadows, some sections of the other Gothenburgs bands, the difference being that Opeth only had the leads and not really the riff-based rhythm ever. It just didn't strike me as much when I heard it, and I guess I was underwhelmed, especially after the immense riff/lead/harmony/chordal/acoustic layering of still life and bwp era the music felt lacking to me.
That being said, I keep listening to Black Rose Immortal on repeat (It's a weird moment when you listen to a song three times in a row and realize you have just spent over an hour listening to the same song).