I enjoyed the first series of this detective drama very much.
It is very watchable and pretty consistent.
There were 3 of the 11 episodes which were either a bit too macabre or had disturbing subject matter, but there were also some really good stories.
I particular liked the ones where we know from the start who the perpetrator is and the story unfolds from both theirs and the investigation angle. Episode 3 was very good.
Axel Milberg (Borowski) is very likeable from the outset. Nothing flashy or heroic, just intelligent investigation. He is joined from episode 3 by Sibel Kekilli (Sarah Brandt), who acts acts a nice foil for Borowski's methodical pragmatic approach to police work.
Unlike most other contemporary dramas of this type, there are no subplots. No personnel relationships, et al, the stories just focus on each investigation.
Some of the plots are quite intricate and a bit confusing watching with German subtitles.
Also, there are a number of issues which never get explained. Maybe this is intentional.
There are also some good performances from support characters in the various episodes.