In my experience firing Crew served weapons(M240B, M249, M2), the recoil shown in game on the MG-34(Bi-pod mounted) and DP-28 is very exaggerated.
Most comparable would probably be the M240 as far as recoil goes(7.62x51mm is closer to the 7.62x54r and 8mm Mauser than the M249s 5.56 NATO). While keeping an accurate sight picture might be difficult, managing the recoil is not at all.
Id initially start off by using my sights and aiming at my target, but after the first burst, I look just above the rear sight at my target and (walk rounds in), this is much easier and surprisingly very accurate.
The sheer weight of these weapons systems is a good balance to the recoil of firing these rounds.