We watched the movie with the Nazi antagonist before we heard of any real conversation in German. People seem to get the impression that German is a harsh and aggressive language. From that, we developed a stereotype of the language and thought they are scary and forceful but in reality, when we hear natives conversing with each other, it sounds pretty nice with their sing-songy tones and flows quite well.
Well, sometimes it also depends upon the dialect and the accent they use. To be honest, it is rather a pleasant language to speak as it is logical when it comes to its grammar and the actual words.