People aren't complaining just because the game doesn't match their current expectations. People are complaining because it's becoming more and more apparent that the game will never reach even the lowest expectations that a lot of players had.
When a game or any other project nears completion, it is exceptionally rare that it gets "better" in a broad design sense, usually you just get gaps being filled in, and you can usually tell quite accurately whether a game will ever be good eventually, given of course that the same people are working on it.
They had 10 years to create a good gameplay loop and learn all the lessons from Warband, but they didn't. Now they've had over an entire year of gameplay feedback but they're basically ignoring the majority of it, and seem happy to just add new features and make minor balance changes when the entire design of the game is awful in so many fundamental ways. If they can't see these issues now, they never will.