Let's say that Russia, Germany, and the USA become communist before 1942 (along with China sometime later) each lead by their own brutal dictator but they mellow out over time like the USSR in OTL. I would imagine that this would prevent a world war from happening since Britain and France would know that they hardly stand a chance against the Revolutionary dream team. But it would also be pretty easy for a split to occur amongst the Communist countries over little things then it would with democratic countries.
So what do you think would happen in this scenario?