People like you have such a one dimensional thought process, I'll talk all day about why I think Ori is a more important exclusive, but not to a douche who goes with the fanboy argument the second I say one game is better than another. P.S, both critics and users agree Ori and the will of the wasps is a better game, so all fanboys?
And no. In Nioh 1 and in everything I've seen in Nioh 2, the world is uninteresting mediocrity. I know you didn't compare it to the soulsborne series, but there is no lack of evidence that the world building and story telling in those games eclipses Nioh from looking at how active and huge the community discussing and learning the lore was.
I think the combat in Nioh is shit to be frank. Its dark souls combat with a bunch of anime type of moves added, none of the nuance, and much poorer enemy design.