FF12 - Space Pope Approved
FF4 - Good if cliched story, good soundtrack for an SNES title
FF6 - Lots of extra stuff to do, not seen in many earlier RPGs
FF9 - Love playing it on "hard" mode (don't learn most abilities, try getting Ex2)
FF10 - Liked the soundtrack, graphics, and blitzball, not much else.
FF7 - Played it when it was still the newest FF. Overrated with bad translation and a ripped storyline but still kinda fun.

The rest I either hated or never played. Not counting the FF spinoffs by the way.