Pointlessly convoluted.
Plot holes abound, sub-par acting, and never once is there a reference as to why the dialogue is in English in a movie that takes place in Germany. Functionally, I get it, because it's probably easier to sell the movie to more markets in English than in German, but in the context of the movie, it's just another unexplained non-sequitur.
The resolution of the movie makes very little sense, and the scenes during the credits only add pointless details which were probably deleted for good reason.