Rambo brings up a good point about the false myth of German superiority. When they faced an equal opponent they got they arses kicked. The blitzkrieg victory early on were against weak nations. Of course Denmark, Norway, Belgium, Poland, Netherlands are going to fall to a much larger country. Not to mention these nations had weapons that were very obsolete. When they finally got to a formidable opponent like UK/USSR/USA they got their arse kicked.
It would be like a country like Mexico invading all the tiny little Central AMerican countries and saying they were all powerful.