Overrated
This is the type of show that the pseudo-intellectuals love simply because it has subtitles and it makes them feel smart to say they watch something with subtitles.
If this show was in English it would be getting absolutely hammered by the critics. It cannot seemingly decide whether it wants to be a serious period spy drama or a comedy and it fails therefore in both. The idea they would have just pick a normal soldier and plant him deep cover as a real german lieutenant is ridiculous. Without training they have him doing ludicrous things, with the most absurd coincidences required for things to work out. Things are more stupid when you realise there is a perfect asset ready to be turned already in the barracks who has the perfect cover.
Its palatable viewing, but thats all.