I disagree with BLU not being so useful. For survival's sake, it adds a lot of options. The only blue magic spells that wouldn't really be too beneficial are the ones that take a long time to cast mid-battle. Otherwise you can chuck out a stun and then cast it.

Urteil would know more on the subject than me since he plans on giving it a shot. Otherwise, I'm in full agreement with what's written there.