I actually disagree on this. I stick to enemy casters so easily with my MNK.
Fists of Wind, Sprint+Invigorate, Axe Kick, Shoulder Tackle, & Weapon Throw.
Dragoons are jumping fiends too.
It takes getting used to, but PvP is actually ridiculously well balanced in this game once you figure out the 'meta' & how to conquer the cheese-tactics (sleep/sprint).
