True, very true. I live in Germany for 10 years now and to be honest, they do not have any sense of humor. Somehow due to the structure of the language which is very complex in front of other languages such English and French and Latin languages, second because of the social life they have. Their life is a heavy mixture of complications (work, taxes, etc.) so they don't have time to develop such attitude. Even their comedians, they are very few considering the huge population. But I would say; German are great and respectable nation. What they did to their country after the war, is amazing. 

Wir brauchen nicht zu lachen, wir möchten nur arbeiten und den anderen zeigen was wir in der Lage sind.