I don't understand how she's shitty in X but not in X-2. In X, she's a girl who had her life decided for her from the start: to become a summoner. This meant she couldn't really fully enjoy life because for her, life was all about protecting people and dying to save those same people. So in FFX-2, after they've defeated Sin, she's supposed to be dead. However, the one constant throughout her life -- Yevon -- was a sham. It's basically Yuna trying to find who Yuna really is, and not some shmuck used for the religion she would have sacrificed herself to. Yuna in X is a strong female lead, Yuna in X-2 is a strong female lead who doesn't know her place in the world. I think the way X and X-2 develop Yuna make her the best female character in the series.