I think the negative feedback on FOV was the down to it being an expansion, rather than just part of the original release. (I think that was maybe intended? I dunno)
It would've felt fine if it was part of the original game, going from freedom to a stalemate vs the black ring after the big secret is revealed and you get trapped. I think most are a bit sore because they had to wait so long for the expansion which doesn't really feel like a whole new adventure, like most expansions generally are.
I can understand how it might feel completely fine if you played the DKS straight through as one game.