Quina's method of learning Blue Magic is fun and cute, but a true Blue Mage wears a superhero costume; I prefer the Blue Magic system in FFV. I also like learning Blue Magic in FFX-2; Gun Mages are cute!

Keeping Quistis's HP at critical will allow you to use her Blue Magic skills often. Otherwise, I don't like for Blue Magic to be used as Limit Breaks or Overdrives at all.