If you think thats what mercs/commandos got, roll one and find out. Theres no mobility at all andno interrupt which hurts us in both PVP and PVE. Grav/tracer is the main setup for the rotation of arsenal/gunnery, its going to get used alot. If your getting owned by long range DPS AFTER you let them build stacks, id say working as intended. Not to mention they have no escape ability at all, so once your on one hes dead.
Commandos and Mercs are DPS classes and they do it just fine. Stop all the whining and learn to counter it instead of getting on here crying about every class that gives you trouble.