I don't mean to be rude, but among the top 4 turncounts, only one of the runs included Shiida. She is definately a good pick, but she is no where near gamebreaking. As already stated, the Altean Trio or Barts can KO Armours and Cavaliers fairly reliable with steel weapons, or can have others chip enough so they can finish. If it was a H3 run, the story may be different, because of Shiida's bosskilling early on. But not in NM.
EDIT: Because I'm almost done my other run, i'll sign up.