Back in the day, many years ago, the Opeth forum was the most active on UM by far, and it was (somehow simultaneously) the only place to go for reasonably intelligent discussion, free of name-calling, trolling, elitism, and general stupidity. I sense that all disintegrated as the albums started selling after Blackwater Park's release and the forum expanded... it's funny to me to hear people bitch about it, though. I keep thinking "but hey... wasn't that the GOOD forum?"
Anyhow, Ghost Reveries is probably Opeth's most progressive work since Still Life. It takes some of the sonic progressions of Deliverence and Damnation and uses them in more classically "Opethish" unconventional song structures. Blackwater Park and the albums since were all a bit of a disppointment to me, I found them kind of bland compositionally, but Ghost Reveries has been a pleasant surprise, especially in the face of all the Roadrunner Records whoo-ah.