Sorry, just to expand a little bit more on your main question.

I believe everything is getting reworked a little for 2.0, but as the moment, I think Gladiator=tank, Mrd=Damage/tank(aoe), pugilist= dot/dd, lancer= critical hit DD, archer=ranged DD/debuff. Their jobs just further enhance their specialties.

If you dig deeper, you could say pug/mnk is like a physical elemental Damage dealer/dot. lol