How will we know if we don't like a game if we don't play it? I didn't like FFXIII, but I bought FFXIII-2 because FFX-2 was a massive departure from FFX, and was hoping for something equally as radically different.
We're fans, we buy the games, it's what we do. An online community like this one represents the diehard fans of the series, and will in the main buy most stuff Squeenix will throw at us.
Basically we can't decide about a game if we haven't played it before. So I agree even if i haven't bought neither FFXIII nor FFXII-2 ect. since I don't have PS3. Plus, I think a fan keep on buying his favourite game despite the quality. A fan will ever be a fan
Then, that's normal he will complain if the game doesn't respect his expectation. But, I think it's only because of his "fan attitude".