Remember that every General or Emperor or Tyrant or whatever is always fighting the last war and thinks HE has solved the problem(s) thereof.
Ergo, Hitler no doubt thought he could beat General Winter in Russia via the use of blitzkreig tanks, even though the majority of German transport in WWII was still horse-drawn.
Hitler certainly made his errors. But looking strictly at military prowess, the Werhmacht was likely as good an army as there has been. I'm sure that even the Israelis study their tactics. No choice, really.