Ironically, Hitler had the right idea. He wanted to go for the oil fields first and not the capital after having taken Ukraine. It were the old school prussian generals that thought they could knock out the USSR the same way they did with France. Of course, this broken clock moment then lead to the generals heeding Hitlers advice on other occasions, which went as badly (for them) as we know. Having the right idea once doesn’t make you “the greatest tactician of all times” it seems.