ff 2,3,12 = 3
ff 1,4,5,6 =4
ff 7,8,9,10,13=5
From the ones I've played (at least one playthrough I mean):
- Final Fantasy III: 3 out of 5
(Typical old battle system with classes is typical. Plus grinding needed to defeat the final boss, which is almost impossible or something. Urgghhh.)
- Final Fantasy VII: 4.5 out of 5
(Loved the setting. Only wished the last section of the game didn't drag on too much. Interesting Materia and Limit system makes the combats worthwhile. Doing a Cloud only game is fun too!)
- Final Fantasy VIII: 5 out of 5
(Loved the setting and pretty much everything else in that game. Nothing to complain about. Also, there are so many ways to abuse the Draw system and get powerful magics at the beginning of the game, makes every playthrough interesting.)
- Final Fantasy X: 5 out of 5
(First time I had very emotional connections with any video game character. Must have been the voice acting and facial expressions at the time. Plus, <3 Yuna...!
)
- Final Fantasy X-2: 3.5 out of 5
(Interesting battle system, but the atmosphere was just not right at all. By the way, since when did Yuna and Rikku become such whore looking?)
- Final Fantasy XII: 5 out of 5 (Best battle system ever. I had such powerful Gambit combos, no enemy could stop me even at a very very low party level. Real sense of tactic involved in that game because of that. Also, the game is just huge, didn't even finish 2/3 of the game and I already reached 120 hours).
XIII might get 4+/5 depending on how big and diverse Chapter 11 turns out to be and the rest of the chapters. First 10 chapters were so dull (gameplay wise that is).
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...
Final Fantasy: 4/5 Own on every system it has come out for (that I own) love it.
Final Fnatsy II: 3.5/5 Good fun on the PSP
Final Fantasy II or IV in Japan 3/5 Was a fun game.
Final Fantasy III or VI in Japan: 5/5 Kefa. Need I say more?
Final Fantasy VII: 4/5 Without Ruby/Emerald Weapon = 3/5
Final Fantasy VIII: 2/5 Draw Magic ruined the ENTIRE game for me.
Final Fantasy IX: 5/5 Great story, great characters, great everything.
Final Fantasy X: 4/5 Enjoyed the game. The ending made me break the disc in half.
Final Fantasy X-2: 3/5 Was enjoyable. Best ending sucked. Good ending was better.
Final Fantasy XI: 3/5 Enjoyed my first 40 lvls (RM/Ninja) but being refresh whore ruined it
Final Fantasy XII: 3/5 Enjoyable, but to easy.
Final Fantasy XIII: N/A Will not rate until I have finished it.
FF - 2
FF II - 3
FF III - 3
FF IV - 5
FF V - 3
FF VI - 5
FF VII - 4
FF VIII - 3
FF IX - 5
FF X - 3
FF XI - ?
FF XII - 3
FF XIII - ?
Average score of the FFs I've played: 3.25
My "perfect" score FFs: IV, VI, IX
GETTIN' CHRONOCRUNK
Final Fantasy 1: 4/5
Final Fantasy 2: 4/5
Final Fantasy 3: 4/5
Final Fantasy 4: 4/5
Fianl Fantasy 5: N/A
Final Fantasy 6: 5/5
Final Fantasy 7-12: N/A
Final Fnatasy 13: 55
I really like when most of people give perfect score for Final Fantasy VI (III in US).
The best final fantasy ever (until now... of course... but I don't played FFXIII yet).
Out of the ones I've played...
best FF is V by far(5/5) and then FFXII (4,9/5), FFX(4,5/5) and then all the others

FF I (3/5)
FFII (3/5)
FFIII (4/5)
FFIV (4.5/5)
FFV (3.5/5)
FFVI (4/5)
FFVII (5/5)
FFVIII (5/5) My second favorite
FFIX (5/5)
FFX (5/5)
FFXII (5/5) It's my favorite so far
FFXIII (4/5) So far I didn't finish it yet