Caster did crap dmg?
Arent they allways mid lvl in the statistics? How should the people even know, how much dmg they are doing (you need 3. party tool for it, and using it is risking a ban).

And ranger have a other advangte over meele (or fast attacking classes). They can have greater distance and can see more of the battlefield. That can help them to survive things. Where meele maybe didnt noticing it and dies.

At last is it for myself, that i survive avoidable things better with distance fighter, as the meele. With a meele is my mindset often only in attack mode and i stop to watch my surroundings (or the camera is to near, to notice things).
With caster and ranger is it other ways. I see more and notice more. Esspecial with the slower blm.

Dnc and BRD are probally good, as long as they have enough/good partner. The mch is coming better, the more people died and have the debuff (because he has the strongest dmg for his own, from the rangers).

More dmg is allways good. But i think, that it shoulnd come so close to caster. Or even to meele.