IV's was good if you like it to be a given that the girl goes for the Hero and becomes a damsel in distress, and you don't mind that it doesn't really develop, but was always there.

VI's was good if you like the story never feeling resolved.

VII's was good if you like the childhood friends type thing, with the added twist that the hero has the personality of a stump.

VIII's was good if you're a 14 year old emo kid.

IX's was good if you like that fairytale touch.

I haven't played beyond IX. Suffice it to say the FF series in my experience doesn't seem to bring that Levin/Kitty or Dominique/Howard Roark engrossment. Not that I should expect that from a video game, but c'mon. Squall??? GTFO.