Sudden WWII Realization!

Well, historically the soviets were the ones who really destroyed Nazi Germany, the Americans were busy with the Japanese and the English did very little in general other than being a bombing target for the Germans. I mean who were the Germans up against in the bloodiest battles (Stalingrad etc etc) and which army took Berlin? The Soviets

I wouldn't say that the Soviets destroyed the Nazis, I will say however, that Hitler had no idea how many of his people Stalin didn't mind losing.
While the Soviets lost (and took) the most in the Euro-theater, if it weren't for the valiant fighting of the European Allies, the US wouldn't have been able to break into the war and the Soviets would've been facing down Germany's entire military might.

I think it can be agreed though that it was a mistake on the german side to face the USSR, and the soviets did the majority of damage to their reich

Yes it was a mistake, and yes, during the Soviet march to Berlin, they did a terrifying amount of damage.