According to
http://en.wikipedia.org/wiki/Final_Fantasy, Final Fantasy was named so because it was to be the game designer's last game before going into retirement. I'd heard that the same was true for Square, that they were bankrupt and that this was to be their last effort, but according to this article that's not the truth. I want to touch on a couple of points:
FF1 rocked as far as games could at the time. It was insanely hard and the gameplay sucked. There was no storyline or characters. But hey.
FF6 was far better but i never finished it.
FF7 is generally regarded as the best video game yet, and I certainly don't disagree.
FF8 ruled too, though i never quite finished it. IMO, Squall is a much better character than cloud.
Guess I've already talked about X. X2 was alright, mostly it was yeah, what emerald said. I never finished it, but I still plan to. There might be other games that accomplish the same thing better, but i'm somewhat attached to the Rikku and Yuna characters.
And the sphere grid rocks, I'm glad it's (sort of) back in XII.