Haha, I forgot about the manual control. I guess that does make her significantly more useful now, doesn't it?
Still doesn't change the fact that, skill-wise, she's the worst character though. The only thing she's good at, the MC is already better at, and you're better off using that party slot for something that the MC would be wasting his turns doing, like healing, Mudo/Hama, or buffing/debuffing, then for more damage(Especially given that raw damage doesn't mean crap, since 99% of normal enemies in the game can be killed with Team-up Attacks, and the 1% that can't you already have Minato to deal with). Pretty much the only time I would advocate putting her in the group over others is during the Stasis Giant fight, where high-powered ice skills are the only thing that even hurt them(And especially in FES, where Null Slash and Gloves doesn't auto-win the fight for you). Mitsuru simply offers the worst support to the MC in the game, and since all the most effective strategies revolve around that, she's the worst.