German humor is fine, but much of german humor does not translate well, because it is often using puns, homophones, double entendrse or subversion of expectations, and you have to actively listen - just hearing without paying attention might result in not even realizing a joke was made. And I wouldn't say it's mean, but it is often dark and hitting where it really hurts regarding whatever goes wrong in society. I heard once that people start laughing if they can't bear the pain anymore, and a lot of german humor fits this saying well.