Hmmmm... best FF...
13 tried to much to be something different, awesome gfx though
12 was a MMORPG
10x2 was a god awful grind
10 was so-so and corny (daddy why can't you love meeeeeeeeee)
9 I never had the guts to try (3 friends tell me it starts being fun after the 72 hours mark...)
8 had too many problems (enemy scaling faster than my level? wow, I just gimped myself at 99!)
7 was a good ride, OK story, good characters, interesting system (materia)
6 had a very powerful cast (if you ignore the lame ones like Umaro, Mog, painting girl, etc.) and OK story
5 was a god awful grind, but Galuf is the shining star of the whole game EDIT: and Gilgamesh ;_;
4 was an OK ride, but I hate all the forced character switching
So overall, I guess I'd go with 6. The depth of the characters just makes the whole game great (Seltzer's ship, Locke's past love, Sabin & Edgar throne thing, Cyan's kingdom's fall and who could forget F-ING BAMF SHADOW!)
I still feel they should have given a better reason for Kefka to hate the world and want to destroy it though =/
I didn't really like Tidus... but then I met Van (Vahn? Vanh?) and now Tidus seems like a great fella.
PUT A GODDAMN SHIRT ON WILL YA!