Ask any veteran of any army in WWII which machine gun (or any gun) was the best and most will say their own. It would take a lot of nerve to admit that someone else had a better one. But sometimes I get the impression that sometimes there's a general feeling among soldiers that their enemy has better weapons. Often as not they just have better propaganda.
The odd and unique Japanese light machine gun only used rifle clips. It sounds like a good idea but apparently it sounded better than it worked.
There are outtakes of the TV show Mail Call on youtube on which Gunny is attempting to demonstrate various weapons and other militaria but mostly achieves a very high rate of failures, followed by high quality cursing. But in defense of all of those malfunctioning weapons, virtually all were of WWII or earlier manufacture. But also, as was said of a certain French heavy machine gun (not a Hotchkiss), they worked but it required a dedicated machine gun afficianado (which all readers of this forum would be, of course).
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.