The acting is superb, and the dynamics between the characters is brilliant -- especially in the problems raised by Sorjonen's sordid job and how it affects his home life despite his best efforts to keep the two separate.
One of the strongest parts of the show is the interplay between Sorjonen and his daughter Janina. The spectacular Lena (beautifully acted) came on strong at the beginning of season 1 yet seems to have become just another detective, which is a crying shame, as that character has great untapped potential (especially when played off Sorjonen).
Compared to most other Nordic noir, the crimes are kind of weak, suffering from unnecessary convolutions and improbable incidents, and replete with coincidences, unlikely motivations and sudden, 11th-hour epiphanies -- and this even allowing for the thrust of the show, which is to present us with an eccentric cop with a unique methodology that gets results in unsolvable cases. Still, love the show. It totally rewards binging.