Thing is while most weapons in this game work more or less good in the game, they don't really work like in RL... to much discrepancies.
So that is what makes people think that something is wrong.
Granted some of the people have gone so far that mere reading their posts makes me laughing...
Anyhow the key for most of these "problems" with weapons really is - improved DM.
That will make some weapons (or if you like, all of them) more effective, and the LMG/HMG are the ones which will really benefit, as they will be able to damage more stuff on hit...
Looking forward to the Rise of Flight
...