Are you sure the LMGs need much more done to them?
Take a look at this scoreboard. Admittedly I don't usually do quite this well (or nearly this well)... but that's a DP-28, L3 class, roughly level 35 weapon. Top kills for both teams, top score for red team, 2nd highest score overall.
I don't think I did any hipfiring in that match at all. I generally find the DP-28 isn't much good for that - MG-34 is a lot better.
Seems like a reasonable presence on the battlefield to me.
Using evidence which is basically saying 'hey guys, i'm really good with weapon Y on map X' isn't really helpful. The point is the machineguns have a very limited role on the battlefield in a game that believes it's self to be realistic. Don't get me wrong, you may have done well with it in that specific game, I have as well but the simple point remains it's presence is just a bit of a fizzle.
The MG34 and later the 42 were the cornerstone of the German Army and their tactics and were there to suppress and kill the enemy. The riflemen would cover and pick people off and advance when the 34 or 42 provide cover. At the moment when I have an MG34 shooting at me, one round will land at me, the next will fly over my head, this knowledge combined with the complete lack of useful suppression effects and that if i get shot i have a good chance of magically bandaging myself. This all leads to the point that the MG is no where near as important in the RO2 battlefield then it is in other games. In the HL2 mod RNL it actually showed a much more realistic portrayal of the warfare, though I admitt it is more rural. The machineguns were a force to fear and were pretty much the post important 'class' there was.
And before people say 'what about the Russians', i'm getting to that. Now the Russians LMG was no where near as advanced as the German's, but this isn't something new. The Allies (British and Americans) had similar problems as they were relying on the portable BRENs and BARs to give support fire to advance. Both magazine fed automatic rifles that were just completely outclassed by the MG34 and 42.
The point i'm making is that firstly it's pretty obviousd that TWI have 'nerfed' MG43 by giving it silly recoil which puts it on a bit more of a level playing field to the DP28. Secondly the suppression effect and bandaging that I mentioned previously really don't help establish the presence of the machine gun.
But don't get me wrong, with GOOD squad work it can be used as it was 'in the day' BUT it's still no where near as effective and is a prime target for the robo-armed super-sniper armed enemy, be it an SVT/G41 or an SMG from 150 meters away.