I have to add a note of praise for The Monolith Deathcult's 'Triumvirate'. Their previous albums were so-so, but the new one is sheer brilliance from beginning to end. Words alone cannot express the joy I felt when I first heard the 300-inspired track 'Demigod'. Best song on a beautifully crafted album of original and musically diverse Death Metal:
http://www.youtube.com/watch?v=-PImT36YbFw
This album has nurtured my desire for Brutal DM. I always want more music from the genre, but the vast majority of it leaves me cold. I appreciate Nile consistently, old Deicide (though they don't really exemplify Brutal DM); The Monolith Deathcult, and a handful of Cannibal Corpse tracks.
I find most Death Metal too soft (too watered down by Heavy Metal/Melodic influences or toothless production), too Punk/Hardcore, or too chaotically technical to really enjoy. I appreciate complexity, but not at the expense of catchy riffs. I should love Vader and Morbid Angel for example, but I dislike the stop-start song structure they tend to employ. This is my problem with most of the better DM bands. And on the catchier end of the spectrum, I hate the Children of Bodem style vocals and comparative lack of aggression that epitomizes the more mainstream stuff.
With all that in mind, I'd appreciate recommendations. I could list a clutch of bands I don't care for, but that would probably alienate people with useful opinions. Just be aware that I've YouTubed 90% of the DM bands/albums recommended in this thread, and only 'Triumvirate' scratched my itch.