Not sure to be honest. Some of Nioh 2's levels are solid, but being level-based the aims are slightly different - not a strong point for the series though, I agree. Dark Souls 2 has good and bad: areas like No Man's Wharf, Huntsman's Copse, and Heide's Tower suck big time, but Lost Bastille, Earthen Peak and Forest of Fallen Giants (once you reach the Fort) are genuinely great.
I don't think Lies of P ever hits the same kind of highs - Vinigni's Factory is the best to my mind, but it has none of the layered, labyrinthine complexity of Lost Bastille and doesn't come within a hundred yards of FromSoft's usual quality, let alone the dizzying heights of Lyendell or Undead Settlement. The lack of enemy or encounter variety is a huge part of this too: Lies of P has less imagination here than even Dark Souls and compared to DS3 or Bloodborne, it's just leagues apart.
I still think it's a very good game, but it doesn't even eclipse the worst of FromSoft. Dark Souls II has legitimate failings but does so much more than any other game in the series to expand the Souls formula (for which it gets next to no credit) that, Flawed as it is, it's a far more important and impressive game than Lies of P.