There's no fixed amount of time a game should spend in EA (or development in general) to be good and it doesn't even make sense to assume there should be, given that every project is a story on its own, potentially with massive differences in size, scope, complexity, etc.
That said, I can't deny that so far I found the pace of the changes/improvements jarring to say the least.
Feedback gets hardly ever addressed explicitly, when the demand is satisfied some of the most requested fixes are introduced almost stealthily and even minor tweaks are taking forever to be implemented. We are past a full year of EA (which according to the early, most optimistic estimations was supposed to be the length of the thing in its entirety) and most of what we got so far can be summarized in: "one class and half and a new minor area".
We also got a certain amount of additional polish, but that's almost more worrying than comforting, given that even things that got a new coat of paint (i.e. new cinematic and dialogues) are still looking fairly rough and nowhere near where I expected them to be one year later.
