To the Red Army of general Shukov and others we owe a thank you, they helped liberate Europe. Maybe we would have defeated Adolf without them, but I doubt that. If not for a war on two fronts and the Russian campaign destroying the bulk of German army strength, the allied forces would have had a lot bigger task when they landed on the French beaches, if not an impossible task.
Adolf dug his own grave, he destroyed Germany in the end. He choose to attack Russia and because of those pathetic Italians under Il Duce, the Germans were forced to fight in Africa too.
If Adolf had not done those two things, we might all be speaking German in large parts of Europe.
What if the 3.8 million troops Adolf threw at Stalin would have been able to fight in France? Or in the south of Italy?
What if the 2.5 million allied troops had faced a fresh German army of 4 million rather than the 1 million they ended up facing? With the 3350 tanks they used against Russia, the 2770 planes and the 7800 artillery pieces against the allied forces in France?
So in the end Adolf saved the world from Adolf if you really think about it. His insanity and arrogance cost him everything. His biggest mistakes where attacking Russia, helping Italy in Northern Africa and working together with Japan (which meant declaring war on the USA).
Hitler was full of bad ideas and his bad ideas and his megalomania cost the German people hundreds of thousands of lives, as well as the millions of people in other countries who died because of his war and his arrogance. Thinking that forcing troops to stay put instead of retreating and defending the German motherland. They died or got captured and then died in Siberia because of Hitler's incredibly bad military choices. And thinking his troops would fight to the death and the leaders of these army groups would rather die than be captured.
Hitler thought that by promoting General von Paulus to Field Marshall would force him to commit suicide (because no German FM had ever been caught alive because they would rather fight to the death or eat a bullet) but von Paulus was a brave man and he surrendered and his troops where not allowed to commit suicide either.
In short, Hilter was an idiotic moron.