Quoted:
Well it popped out enough bullets to end the Reich.
It popped out enough bullets to be a favored pick up of the Wehrmacht and Waffen SS on the Eastern Front.
I'm sure all of the other countries that helped would like some credit! Russia didn't win the war on it's own, and they didn't supply weapons to the rest of the allies! Also is now a bad time to point out that something like twice as many Russians died as Germans? I'm thinking the tsunami of Russian blood and corpse-parts may have helped them.
As for the PPSH-41 being a favorite pickup, yhea, it was. They captured them in droves during the initial 1941 ass-kicking they dished out, and already had compatible ammunition (7.63mm Mauser) in the supply line. It made a nice weapon for troops otherwise only equipped with a bolt action rifle to grab up.
Russians had no problem picking up German weapons either, BTW! They were putting Kar-98K rifles into service whenever they had the chance, even though it didn't shoot ammunition they had on hand.