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The film has been described as breaking a taboo which for decades has seen German soldiers generally portrayed as callous zealots or conscripts tormented by conscience. But there has been renewed appetite for exploring the country's wartime past since the release of Downfall in 2004, and later this year Tom Cruise plays Claus von Stauffenberg, the German colonel who tried to assassinate Hitler, in Valkyrie
I don't know what war movies they were watching but there were a great many US post war movies that showed the germans as honorable foes, usually with the same British accents that the ancient Romans usually had.
It's interesting that the Japs are almost always shown as very strange sadistic fanatics when the German regular army was shown as regular joes.
Maybe that's just my perception though.