Problem is unlike the hmg it melts both it's target for a defense (shields) and what it should be doing less damage to (armor). Also I've used it for a long time, I'm pretty sure I've got an accurate critique on it. Also if that really distorts your aim you have brightness too high

(If I didn't misread what you said) you claimed that no other weapon worked against armor in a similar fashion when those weapons clearly do more damage to armor, while not out to the same range the mass driver deals more raw damage

I believe that protoman has already stated that he is more than willing for the HMG to be allowed on the Assault suit so that he can roll it and show people how to use it properly.

Also your argument at the end is regarding the broken dmg mods which should be fixed. Instead of nerfing a weapon that may or may not be benefiting from the broken dmg mods why dont you fix those first?

-Even at 95% efficiency the dmg output it much greater than the AR. Oh and ARs get less efficient against armor but gets a slight bonus on sheilds.
-Not all AR rounds land on target either as while HMGs have a small cone fire ARs have recoil
-I honestly dont know if the standard AR can hit beyond 100 meters the tact AR can but that is worthless right now
-HMG also has 450 mag size so you dont have to reload very often but if you do it takes a while. ARs have to reload after 1 maybe 2 kills. Since HMGs can easily kill 6 guys without reloading we can assume 6 kills then 8 second reload. ARs assuming 2 kills per mag has to spend 9 seconds in reload.

-Lasers dont have to contend with a horrible ADS sight that basically nullifies the supposed 100+m range that the ARs have
-Lasers when firing strip sheilds at 120% and when it heats up they do massive dmg although its unknown what that value is considering it burns through a heavy with 1000K armor faster than the Duvolle we can assume its pretty high
-The dmg done to the user when the laser overheats is laughable at best. I have never overheated my laser on accident and when I did it on purpose it dinged my shields. Yes the skills for laser are broken but I bet that you actually get all of the skills by putting 1 lvl into it because otherwise the laser wont ever overheat since it only overheats after 80ish rounds.
-I do think the lasers need a bit of work but I am willing to wait until the issue with the broken skills get fixed and then look at them again.
-ARs when taking dmg had to deal with even more recoil while no other weapon has this detriment of...if being shot making it harder to aim and return fire

ARs can be competetive in most situations but the SMG/HMG/Shotgun beat it in close range, the HMG can beat it in mid range, Laser can beat it in mid/long range and sniper beats it in super long range, MDs cause aiming to move off so can be good in most ranges if the aim is good. If you consider the actual mathematical values the AR loses to these weapons in stats. Which means its more the user who determines how good it is.