When I last played Div1 it was the same, not sure if it is now or not. But LMG's still are the one and only weapon in Div2 for PvE. Outclassing even snipers in actual kill speed. They have the range, the mag size, the dmg, all you ever need and do it better than anything else if you really think about it. Yes snipers can 1 shot a red, but you have to wait for them to stop moving, pop their head out of cover and line up your shot. When you could have been shooting them the whole time with an LMG. AR's, submachines, shotties, etc... all have pitiful damage and clip sizes for how much hp enemies have. Add +reload mods to an LMG and it is the best weapon for all situations.
Please look at rebalancing so that more options are viable.
The increased mag size on AR's make them more tolerable, but you can do the same with an LMG and kill 4-5 times as many enemies without reloading as well and more efficiently. The higher dmg per shot makes dealing with the AI much easier than an AR as you can kill them before they get to the next cover spot rather than getting them 2/3rds dead with an AR and having to wait for them to pop back up. Sniper rifles are in a pretty good spot yes, but there are too many situations where you have to wait to shoot one (hit registration when enemies are moving is terrible, better to be able to pump mass amounts of bullets at them while they are running).