Besides Loathe, in terms of heavier albums, Deftones/Misery Signals/DGD all released albums that I thought were pretty middling within their OWN discography, but still in a class far above the majority of the overall music landscape. I'm someone who loves almost every release all three have done for years, though. Svalbard's album is something else too, just beautifully heavy and layered. Protest The Hero delivered as usual.
For alternative/rock stuff, Bitch Falcon's release this month was really cool. They are an emerging band but they took on a new sound on this album that calls on everything from indie to art-rock to heavy post-punk to shoegaze.
My three fav albums this year all came from electronic/pop artists, although Poppy's album was more or less a full-on metal album.. hers, for sure is up there. My ultimate favorite Grimes, just released one of the most diverse albums I've ever heard this year; you can't really put a genre on that album but it's got a decent amount of densely heavy music influence for an electronic-pop artist. Purity Ring is still just making beautifully written, heavy groove witch-house electronica that is getting more and more melodically accessible but still retaining plenty of emotion and artistic integrity. Also for pop stuff, really loved Charli XCX per usual.
Far from a complete list, but that's a handful of my personal standouts.