This bandwagon is getting rather cramped isn't it?

XII for me easily has a superb script and writing, though the only criticism I have is that it isn't rationed out equally. Gems like Balthier, Ashe and the Judges have to keep dragging along Vaan and other characters who didn't really make a dent in the story.

As for the worst script? Hard to say. The FF games I have played for me never really stood out as "poor" writing wise, but I guess the weakest link is probably X, if only because of that infamous laughing scene.