I don't see why the Germans can deviate from their historical strategy, and the Allies get no chance. The US is not allowed to land in Normandy with M26s, the Soviets always have to put up an inept defense, and the French always get simply bulldozed(this isn't really how they fell, but you have to make the french pathetic and weak).
Had the Russians defended their country logically, then the Germans would not have gotten near enough to Moscow to threaten anything.