I watched the film today with my whole family and we all found it hilarious. The story is mediocre but the dialogs are the best we've seen for a long time.
It may took you 15-30 minutes to get into the film but then, there was not a single minute we didn't enjoyed the funny and intelligent (i mean obviously stupid :-) ) conversations and situations. If you like this kind humorous puns, you will love this movie.
I liked this film so much, i had to register to give it a bit fairer rating even so i didn't like german films in general.