First off let me say i do not care about historical accuracy, as this by no means is a simulator. My only interest is in game balance.
The HMGs were a good addition to the game but have some sever balancing issues, the biggest of which is their ability to destroy sandbag walls instantly. Sandbag walls are one of the few tools that players have that can make some difference to their surroundings that might enable them to hold a position, or to advance to a position. So why does the HMG melt them instantly?
We were in a game on Berlin earlier, the long hallway with a bunch of sandbags, and we added another 20 or so to it. They set up a HMG at their end and cleared the entire hallway of all fortifications with a 3 second sweep of the HMG. After which we couldn’t move up through that hallway whatsoever, even using smoke to block their vision, they just kept sweeping back and forth with it, keeping us completely pinned in our spawn. (The other area was being constantly molotoved.)
Letting it punch through thin wooden walls is fine, being able to damage tanks is fine, but at least make sandbags work against it. Smoke is NOT enough.