MCH is not even properly using its gun at 80, just doing flips and "releasing the heat" (i would even say that player Machinist is not related to Ishgardian Machinists).
Machinist needs a serious rework or we need Gunner job to fill the gap. I'm personally starving for similar job since MCH got killed in 4.0.
I would personally choose two handed gun instead of dual guns.