I don't understand the low rating. I was laughing from start to finish. Schweiger& Schweighöfer delivered great performances. And as much as I hate saying it, Schweighöfer did a much better job at that than Schweiger. The jokes and lines were great and their chemistry was believable. This is one of those movies I would watch over and over again if I caught it on TV.
The only critique I have is that the resolution around Steiner's family could and should have been better. The resolution to his family's problems wasn't smooth and that made it feel like the story was rushed and therefore distracted me a little from enjoying the movie you. Nonetheless, I thought the movie was great and look forward to watching it again.