Of the ones I played, I only finished the following once:

II-- because the game is terrible. It's not even bad for a final fantasy, it's just /bad/.

VIII-- I might have /eventually/ gone ahead with a second playthrough, but it was eating up a few gigs on my hard drive and I didn't have any real desire to play it again, so into the recycle bin it went. No regrets.

Tactics-- I've tried to play again at least twice and then I felt like "eh, whatever." Come to think of it, I may as well delete that one too. Who am I kidding? *frees up another 537 MB.*