I feel like making a list, hopefully it's not forbidden. Please, bear wit me. The reason I decided to do this lies in weird FF2 and F4 hate on gaf. I wonder how it started... Because you know... I remember those being 2 most loved FF games back in the day, and I liked them a lot, great games for their time.
So here we go
God tier
FF7
FF6
never could choose between those 2 and don't know how people can like one and hate other, seems tad hypocritical to me, because you see, these two game have so much in common, especially how perfectly they blend story and gameplay. I still wait for such a varied game as FF7, to this day, and so smooth in progression game as FF6.
Greatness tier
FF2
FF4
FFX
well, ya, you see all those games were mindblowing for their time inspite of having some flaws.
Really fun tier
FF8
FF5
FFX-2
you can ask what they have in common? I think it's pretty obvious, they excel in some things, gameplay related, and falls a lil short in story department.
Good tier
FF9
FF
FF3
All around good games, but not really exceptional as above games are
not so fun tier
FF11
FF12
FF13
FF13-2
FF11 is there because I don't like MMOs anymore, and that's only reason really. FF12 is only really boring FF for me in all accounts and with FF13 games, simply not enough FF for my tastes, not enough diversity in gameplay, bad pacing, story going nowhere and being there just to be there, lack of likeable characters, development and characterization too and way too combat heavy. As I already wrote what I think about 13 and 13-2 in this very topic, I'll stop there.