I'll admit I don't know as much about the Chinese war effort, but it shouldn't be controversial to criticize the Soviet strategy when it was literally "throw as many bodies at the problem as possible", which it factually was. It also ignores the fact that they were allied with Germany until Germany double-crossed them and had Germany not double-crossed them there's a good chance they would have remained on that side. This is after the Nazis purged the Socialists and Communists in Germany after using them to win control in the first place. So forgive me for not sucking Stalin's dick and taking pity on the USSR for catching fleas from the dogs they went to bed with.
This is not an anti-communism or anti-socialism rant. This is an anti-short sighted opportunist rant.
The USSR played a major role in the war once they joined the allies and I'm grateful for it, but ignoring everything before the German invasion of the USSR is silly and you know it.
The way the Nazis treated Soviet POWs and civilians was abhorrent, but to act like the USSR didn't commit their share of war crimes is just as silly whether you think you can justify it or not. Not to mention how things turned out post-war for many Soviet satellites and Warsaw-Pact countries.