FF10 - Beautiful story, world.
FF06 - So epic. I never thought 16-bit could tell stories like that.
FF12 - Story was BS, characters sucked. Still took 100 hours of my life with ease.
FF04 - I almost never finished this cause I started on FF06 >_<
FF11 - Oh wait I don't think this one counts, but I waited 8 hours in Qufim for a group >_<
FF07 - I hated the first move to 3D, I hated it like I hated Metriod Prime.
FF08 - Couldn't finish this one either. I played the card game minigame more than the actual story.
FF09 - Got halfway through but then the horrible art finally got me.