Nioh is pretty great so far. I went from not caring too much about the game and thinking it was bad with the alpha demo, to really wanting it after the very last demo. I'm glad I got this now though. Overall, very familiar to the Souls series, but has way more depth to the gameplay, your character, and the world, which is where the Ninja Gaiden stuff comes in, but to me, this game is super Souls-like more than anything else, but I'm liking it more than a lot of the older ones as I only really liked Dark Souls 3 and Bloodborne. It has the speed of those, particularly Bloodborne. I'm not really taking advantage of everything, there's so much with the stances and skills and ninjitsu and magic...Luckily you don't have to really use the multiple stances and such. I usually just do the balanced mid stance or sometimes high for the stronger damage, but I'm not doing anything too crazy with my axe or single swords.
I'd definitely recommend it if you like the Souls games.