Arkham Knight is fine, I just think most people will agree it's a significant step down in quality after Asylum and City. The story leans heavily on a plot twist that everyone saw coming the instant the game was announced and even the people who didn't know the mythos well enough to see the twist coming beforehand weren't really shocked by it because they didn't do enough to set it up. The underdeveloped story is also paired with a bunch of bloated feature creep. I didn't know it was possible to make driving the Batmobile feel boring/tedious but they accomplished it.