SMH @ the hate. Nioh is great and wonderful. The combat system and movement is beastly (I love fast-paced combat, and the stances add real strategy for those that are good enough). I love From's games (especially Bloodborne), but I still haven't finished Sekiro (and I DO like that game, don't get it twisted), it just didn't hold my attention like Nioh does.
Nioh is just a different animal IMO. Yeah, that poison level is pretty blah, and that's not even my most disliked level (Umi-Bozu). No real complaints about any other levels (until a certain DLC mission). I don't understand the hate about the loot. There's so many different ways you can play the game, finding the weapons and armor sets that work for you is a big part of the fun, and all the loot that drops is welcome. Until you figure out your build anyways, but that comes way later. And even then, some ppl feel the need to change it up, so it still helps.