Well, perhaps not to start an argument, but just as a comment, I think Hitler's rise to power had more to do with the Allies lack of resolve than his strategic genius. If Britain and France had enforced the Versaille treaty after Hitler started breaking it, his regime would have ended pretty quickly. But of course, they didn't. Either through sheer lack of will ... or because they secretely wanted a powerful buffer in central Europe against Soviet Communism.
Nonetheless, if Hitler hadn't invaded the Soviet Union before he had pacified Britain, leading to an unwinnable two front war, he might have gone down as a strategic genius. But here he didn't learn the lesson of Napolean.
Now one German politician to whom I would grant magnus, even though he lives outside our given historical time frame, is the Iron Chancellor, Otto Von Bismark. His combination of foreign policy and internal politics was brilliant.