Ghost of Perdition and Reverie/Harlequin Forest are Opeth classics that strive to the level of the top tracks on even the great Still Life and MAYH. Meanwhile, Isolation years is up there with some of their classic mellow material (which always seems to be better than pretty much all of Damnation - wouldn't you take Credence, Benighted, Harvest, and Isolation Years over that album easily?).
As for the rest of the album:
The Grand Conjuration is kinda weak on it's own, but it is right where in needs to be in the context of the album as a whole. I was disappointed with that song at first, but listening to the entire album makes me enjoy it more.
The Baying of the Hounds and Beneith the Mire are both pretty good insofar as it's Opeth doing classic Opeth stuff but changing it up a bit with the keys. Intellectually, I like them although they're kind of lukewarm at best in evoking any kind of response. In fact, sometimes they fail to hold my attention (in all fairness, sometimes I think I'm ADHD, but I never seem to be able to ignore GoP...).
Hours of Wealth is nice, like the begining of Dirge for November without the boring riffs that followed, but not much else.
Atonement is just kinda weird for Opeth. It's not bad stuff, and good on 'em for trying something different. I can take or leave it, although it does tend to grab my attention again if I wandered off while not paying attention to Beneith the Mire...