[I'm putting this in a seperate reply to avoid confusion.]
I think GR is great. I can tell after listening to it for about a week that I won't like it as much as BWP or MAYH (still their best IMO), but this album does have standouts. Song by song:
Ghost of Perdition: Perhaps their strongest song, and the one you should listen to if you want to get a good cross-section of Opeth right now. To me, this song feels the most like an Opeth song.
The Baying of the Hounds: Rather heavy and resonant of...SL? There's a recklessness in the song that really brings me back to tracks like White Cluster and Serenity Painted Death. I'm not a big fan of SL, to be honest though. I love The Moor and Face of Melinda, but the rest of the album has never really captured me like MAYH and BWP.
Beneath the Mire: Wow, the keyboards really come out here. You will hopefully notice them on the previous two tracks, but they just hit you in the face at the beginning of this song. The harmonies are excellent in the opening sections, as well, especially when the keyboards fade out for the first time. Great blending of acoustic strumming/riffing under heavy yet melodic guitars. I don't want to go on into more details, I'd rather just use this one part as a sort of snippet.
Atonement: The first light track on the album. It really reminds me of Damnation. If you ask me, this is just a progression of Opeth's light side in a song. It shouldn't be a suprise that it sounds so much like Damnation.
Reverie/Harlequin Forest: Reverie is a nice little instrumental piece, and it leads into Harlequin Forest nicely. It actually feels like one is wandering into a forest, due to the little riff in between the chord strumming along with the keyboards. I love those keyboards. Harlequin Forest itself is definetly my favorite Opeth song at the moment. It rocks like Bleak rocks for me. Whenever Mikael sings with his clean voice over the kind of riffing I hear at the beginning of this song, I get chills. Some may criticize this song, saying it sounds too much like a BWP song with a bit of D&D thrown in, but that's just a part of this song. It's not the song itself. The transition around 1:36 is great, too--one of my favorite moments of the whole album. In short:
Hours of Wealth: There's not a whole lot to say about this in my view. It's a great song, but it's rather simple. I could be mistaken here, though, as there really aren't many "simple" Opeth songs. It's a good one.
The Grand Conjuration: I heard this one when it was released on the listening lounge, and in my opinion it's not a really good aggregate of the album as a whole. It's not exactly the sort of song I love, so I won't go on about it. Don't take this as a negative comment, though. I guess I may just need to listen to it more.
Isolation Years: I really like the time structure of this song. The switching between 5/8, 6/8, and 3/8 time really fit together well, and as a result I guess you could label this as the most "prog rock"-ish track of the album. I've never been much for labels, though.
Overall, I'd put it as the #3 Opeth album, behind MAYH and BWP (redundant, I know). I'm really really liking the overall direction the music is going, though. Can't wait for opus #9.