The old final fantasys were cool in the sense you could create your own party of Whatever and name them. Though the Stories Square comes up with are kickass. So far FF VII has the most interesting game I've played, while FF X kinda had the killer storyline.
FF VIII - Er...It looked cool for PS graphics I guess. Only played the demo.
FF XII - Hokay, i know cutscenes usually have more detail then the main game, but do they really need to now o.o... Loved the intro.
FF Tactics Ad. - Meh...If I had a GB Advance then I'dve played it more but tactic warfare is kinda boring when there's other game's to play when borrowing from a friend.
In the end I'd gotta say FF X because I just played it and I'm trying to beat it's sequel.