Easiest DPS To Play?

[Aeliott]

If you're comfortable with MNK right now I'd stick with it. As others have said the "rotation" if you can call it that isn't long at all, and unlike other jobs you very rarely have to think ahead too much. Few seconds of downtime? 1-2-3, all important buffs/dots are up again. Because of the form system it's hard to be penalised (outside of losing Greased Lightning). Other melees have to go through full combos just to get stuff back up, so again - GL aside - it's rather forgiving and straightforward in knowing what attacks to use when. Also generally, MNK doesn't have to think about off GCDs - just pop them when they come up (as opposed to like, Duality and Life Surge etc). NIN is actually quite similar to MNK, they have the same # of core single target GCDs, only they have to be combo'd - plus you have ninjutsu to keep an eye on on the side.

As someone else said BRD/MCH are more quick-thinking and reaction speed than rotations, with BRD being the easier one imo. My tl;dr opinion though - stick with MNK if you enjoy it, give BRD or maybe MCH a whirl if you want to try something else