I agree with the general sentiment of your post, but I feel that Ominous Doctrines... is a bit more substantial than you give it credit for. It feels like the musical and conceptual capstone of their career; as if their entire discography has been leading up to it and is to be the lens through which the rest of their work should now be viewed. It was one of the few albums from last year that I can see myself enjoying decades down the road, for sure.
I don't think there have been any epoch-making albums released this year, but there are certainly a couple of greats that will stand the test of time. The new Autopsy is a brilliant re-interpretation of death metal itself (by this I mean the conceptual fixation on morbidity and an examination of life through death) that hearkens back to the old sound from a more modern standpoint that I can only describe as "theatrical" (there were hints of this on Mental Funeral, but it's in full effect on Macabre Eternal). Mitochondrion's Parasignosis is a more focused expansion of their already unique sound on Archaeaeon with some interesting albeit slightly hackneyed lyrics, and Necros Christo's Doom of the Occult is neat if not only from a structural standpoint with the use of interludes that, *gasp*, actually play a non-trivial role in the album's aesthetic (for another modern example of this, see Teitanblood's Seven Chalices). I would say something about Negative Plane, but I'm really not very familiar with the band's work or the angle they're coming from. I would investigate them, regardless.
