I don't think this game is overrated and I typically don't read into the reasons why someone would say it is.
As with Final Fantasy VII haters, it typically has less to do with the quality of the game itself and more to do with them wanting to feel unique by having an opinion that isn't popular. Not directed at anyone here (I have yet to read through this thread), I just mean as a general.
I just live by the idea that if you like a game, you like a game. And that's cool. Don't waste calories telling someone else why they shouldn't like it as much as they do.