Actually, the Russian track record of winning battles have been poor the last 500 years. But that doesn’t matter, because its impossible to occupy Russia. When your army is in Moscow, your supply line is too long. Russia is the biggest country in the world, twice the size of America. And it is a winter land with mountains, snow, blizzards, swamps and marshes, and only a few dirt roads that turn into mud roads when your trucks come with supply. So basically, the problem is not to kill the Russian army and conquer Moscow, the real problem is to supply your victorious army. Read the book Prisoners of Geography, Ten maps that tell you anything about global politics, by Tim Marshall. He explains why the Russian territory is too large to capture by any other enemy powers. Russia have been attacked and lost many wars, against Poland in 1605, against Sweden in 1708, against Napoleon in 1812, against UK, France and Turkey in 1853, against Japan in 1905, against Germany in 1917, against Poland in 1920, against Germany in 1941, just to mention the big ones. And when Russia attack minors, like Finland, Afghanistan and Turkey, they usually lose them too. Russian soldiers are really poor but that dont matter, since it is impossible to occupy Russia in the long run. You can hold part of it for 3 or 4 years, but that’s it.
So again, the biggest mistake Hitler did was not the preemptive attack on Russia, that was actually a rational idea, but the mistake was to try to colonize all of Russia in a short time. It took the Brits centuries to kill the local populations in North America, Australia, New Zealand, Canada, South Africa and so on, and colonize it. Hitler would do this to Russia in 3 weeks. That was the mistake. I think Hitler could have won the war if he only secured the buffer territories like Finland, Baltic States, Belorussia and Ukraine, and let the next German generation decide if they should continue into proper Russia. This lines would be easy do defend. The route through Belorussia is a bottleneck with natural flank protection by marshes north and south, same with the Bessarabia route. Stalin would get trouble trying to get it back, considered the state the Red Army was in at that time. Then make a stalemate with the Western Powers. London would probably accept that since the classic English strategy is power balance, and a Great Germany would balance with a lesser Russia and an imperial France.
Another mistake was to run 2 different revolutions at the same time. Hitlers first object was his attack on religion, he tried to remove the Jewish and Christian religions, but had noting to replace them with. Stalin replaced it with atheism, and that worked for a while. But Hitler did not replace the absent of religion with anything, he had nothing new to offer, except the worship of himself, and that did not fill the void. Its nothing wrong with replacing religions, and its nothing wrong with land grabs, but Hitler did it at the same time, and that would be too much for one man to fulfill. Both a war against the domestic peoples religion and faith, and at the same time another war against foreign countries. Too much, man, not big enough jaws for that
just my 2 cents, and if you run out of arguments, please dont fall back into plan B with ad hominem attacks, out of the 8 billions angry people of the world, we are just a fistfull of history buffs that share an interest in this topic, we should be brothers, man