the best way is probably by following the labels of bands you already like (bandcamp can be helpful with that sometimes, and fb). otherwise, i fall back on anus and NWN. the former are a bunch of tossers, the latter jerk off over the nth solid war metal album too much, but plenty of them know their stuff in both cases. aside from that i just listen to certain people here or there who have good taste. good BM is really hard to find nowadays though i agree, the infestation of contrived weirdness and superficial genre splicing and conceptual gimmicks is one problem, the other is people worshipping too much generic clone stuff, much of which comes under the atmo-BM banner in my experience (it's a helpful sub-genre tag only in how it helps you avoid the crap). there's also the pseuds who worship anything that's super intense and discordant, which is fine if it's your bag but i tend to find that stuff pretty alienating.
some new BM i recommend:
panphage - drengskapr (BEST)
slavland - wiec
horns and hooves - consecrate the marrow
tarnkappe - winterwaker
morbus 666 - ignis divine imperium
cirith gorgor - visions of exalted lucifer
stilla - skuggflock
not sure who likes them around here but the new countess is cool in that typical countessy way, as well as the new sorcier des glaces, new baptism, new belenos (unusual, feels like it should be hipster-approved but i liked it), new antaeus (kinda), new black funeral (again surprisingly) and those various bands riffing on the greeks this year. those two involving moonblood members were cool although as i said before the new material isn't as good as the old stuff on them. i rather like that forteresse thing as well, but that's pretty popular in general.