I'm not sure I like how killtastic the MG42 is considering how beastly it is at suppression. Its just so damn good. 34 might need a buff but its closer to how I imagine the MGs should be than the 42 is, personally.
Due to the way grenades work with how you can throw them despite being suppressed there has to be a penalty for staying close to/in front of an MG for to long. That's why MG's have good killing power; the MG34 shouldn't be an exception to this.