The pop thing is maybe not 100% reasonable.
What i wanted to say is that i can't find anithing moving in Agalloch's music except the music. It sounds quite shallow and boring (although i love for example Ulver's Kveldssanger), and it is not especially heavy, neither emotionally, nor musically, nor in the sense that it might be difficult to get into because of too much folk -maybe that's why the term pop came to my mind.
If everyone likes them, have fun, but i was really disappointed by The Mantle.