I really -really- disliked this game. So much so that I will simply give my opinions on the characters and nothing more. They don't really deserve to be rated.
Quistis attempted a story line. Everyone knows she's in love with Squall. It's the most obvious thing in the game besides Selphie being stupid. Then she pulled the whole "I only love him as a brother" thing. Right Quistis. I think this was the point in the game when the developers realized "Oh shit, we forgot that Rinoa needs some reason to be in the game." Hence the abrupt decision Quistis makes to not like Squall anymore. Quistis completly dissapeared after this. Such a shame...she had such potential.