I'm apparently in the fortunate minority to get really consistent frames, although it still hovers around 80 for me, which is fairly lower than usual.
I've heard complaints that the overworld is apparently reused, but as somebody who played the first game recently, I don't really notice it. Same goes for the "woke" thing about every other character being some minority. After a few hours, there's not many token characters to the point it stands out to me.
Gameplay wise, yes, the combat is pretty much identical to the first, but that was easily the highlight of the first game anyway. So far I don't really have many complaints about the game, but I'm only a handful of hours into it.