I have to agree, especially the 42 can be basically useless while the DP is deadly accurate.
Once I was just in a perfect position with the 42 and saw a Soviet coming at me at about 30 meters max, I put a perfect short burst right at him at this ridiculously short range, no effect, another burst, oh he must be dead by now....oh oops he's shooting at me! OK, Looooooong burst, another long burst right on him-oops, I'm dead.
Later, when I complained about the 42, he admitted that I had hit him in the leg. This is just one example of many ridiculous and frustrating situations with the German MGs. You just stare in disbelief as the rounds seem to go anywhere but at your target, while the sights stay on him all the time.
I've tried so hard to like the 42 and 34, used one-click bursts, longer bursts, aimed low, aimed high, fought the recoil lightly and strongly, and still they're basically USELESS compared to a rifle at long range. Don't get me wrong, you can get kills, but only if you're incredibly patient and the enemy are incompetent. The thick "shoot me" tracers just make matters worse while you don't have any real use for them yourself. The only real application for the German MGs is suppressing a medium-range target, which puts you in range for grenades. They're real scatterguns. The MG-34's semiauto option doesn't help any either. The German MGs are very cool for atmosphere and some rare close-range hallway suppression, but that's it, for anything other than joking around I'll choose a rifle or a DP.
By comparison, the DP is very accurate, low-recoiling and doesn't even need a barrel change.
MG lovers don't take this personally or anything, but this is the impression I've gotten over and over again from really trying to use the MGs properly.