ive got a level 50 commando on the thena vash server and i can't agree more with the quoted post, commandos are by far the easiest class to counter with the "gunnery" tree, that tree is the one you are complaining about as it gives gravround.
and no we don't "just" spam grav round/tracer missle, while we do use it alot, it is the basis for our rotations, grav round can give armour buff to us, debuff on enemy players and it boosts the damage of demo round and high impact bolt, which are our main burst dps moves, grav round also boosts full auto giving it 25% more damage, so yes we depend on it alot, but its called "inturupts", an easy type of move to use on us, when you take away our grav round you SEVERLY reduce our dps, which is what you should be doing, if you are not then you need to learn how to kill us better. as for our debuff stacking, if you are being hit by 2+ commandos, then for the love of god
line of sight us
its easy to do, and it is annoying for us as gravround/trace is not instant, so we are stationary to do considerable damage
2ldr, use inturputs/los us and you're fine, if not prepare to be killed off