I know it's been done several times, but not for a while. List the games in order of your favorite to least favorite. Let's stick to I-XIII only here and avoid spinoffs like Tactics and direct sequels. Only include games you've played. List the ones you haven't played below. I may or may not use this data for something in the future.
My list:
1. FFVI
2. FFVII
3. FFIV
4. FFXI
5. FFIX
6. FFV
7. FFX
8. FFVIII
9. FFXII
10. FFIII
11. FFXIII
12. FFI
13. FFII
Haven't played:
None