While it's definitely become one of my favourite FFs over the course of these last few years, I can't help but still moan about what could have been.
I mean, I don't think it is all too controversial to say that the Judges for instance had so much more potential than what we got in the final game in the end. I still love what is there, but just imagine how much better it could still be. Putting every other Final Fantasy to shame, basically. Not that 6, 7, and 9 wouldn't still be very close contenders as well, but I think 12's concept is the most appealing to me on a fundamental level, but out of those four games probably also the one with the weakest execution in the final release.