pvp needs a place, im strongly against "open world" duels... not to mention all the stupid duel requests from random people you have to decline all day in the manner of "Yes mr. lvl50 dragoon i accept your challenge with my lvl20 conjurer, suuuuure".
open up the little Colosseum for people and let them fight inside after talking to a npc and being in a party of 2. that i would actually like, but the classes/jobs need to be at least a bit balanced, its just no fun to be told: "you can fight me but you're not allowed to use most of your spells" that's just lame