OK, you might have seen similar plots before, like in the danish "Pusher" movies: drug dealer with everything under control, makes a few wrong steps and it all spirals down. Its true to its genre as a gangster serie, but still it adds something new and interesting. I really love the atmosphere: it's none typical soundtrack, creative use of CGI, beautiful cinematography and locations that either helps to tell the story or adds atmosphere - or both (the location scout has done an excellent job indeed).
The acting is excellent. Kamil Nozynski, playing Kuba, gives us a main character we care about without playing on more strings then what is absolutely necessary. Jan Frycz, playing Dario, is giving us the best bad guy since "Herr Starr" in Preacher. Marta Malikowska is making a stunning performance, as this interesting female character, Pazina, which has depth and is far from stereotypical - something I often miss a lot in this genre.
Yes it's violent, it got some dark humor, some really interesting dialog, and it also got something you don't expect. Like the scene when the characters sing a little bit from the same song...
This is the first polish TV-serie I have seen in many years. But this has definitely made me open my eyes for polish TV-drama in the years to come.