Been a fan since like 2005, Leviathan is still my favorite, mostly just because of how consistent the theme of that album is. Saw them live when they were touring with Against Me for Blood Mountain, first concert actually, it was pretty great despite each band took like an hour to set up. They use to do a great The Bit cover, looking at youtube apparently they can't pull of the vocals like they used too.
Enjoyed Blood Mountain, and I appreciate Crack The Skye's ambition, even if the songs where they don't go for broke kind of drag, I.E. Ghost of Karelia and Crack the Skye. Both ten minute plus songs though, great. EDIT: Think I meant Quintessance.
The Hunter though, can't stand that album. Besides Curl of the Burl, Blasteroid and The Hunter, don't enjoy any of the tracks, and two of those have massive caveats. Curl of the Burl feels a half step two fast, like they had a perfect stoner metal riff and decided to speed it up...cuz yea. And Blasteroid, talk about just doing something completely different and being great at it, till they get cold feet and include that blood-curdling scream and "metalness," gross.
Also, I second any recommendation of Acid Bath.