If you listen closely through the roaring sound of those MGs you can hear the Vickers and Maxim silently crying in the corner.
Vickers still has insane dps for a stock mg (not quite as good as the .50 though) but its suppression is very lacking at all stages of the game. Two volks running straight at it about 10m apart will definitely be able to nade it. I would literally rather have mg34s than maxims now.
@OP I think that the mg34 is definitely a subpar mg in general, but it also has the misfortune of being compared to the mg42, which is an outstanding mg. The 34 deals hardly any damage but I think its suppression is serviceable, and you do have stgs out the ass to back it up as well. One of the most frustrating things in teamgames is when an ost and okw set up an mg42 on key battle areas (fuels on red ball for example) and have volks and sturm(s) in support, because without mortars, it's extremely hard to break. That still holds true later in the game as well, but if okw got a good mg like the 42, it'd be wayyy worse.