I was expecting a decent crime thriller but instead I got me some incompetent and plain stupid police and some rather unlikeable victims' circle type characters. The whole plot rests on people acting stupid and impulsively. And in all honesty in real life they probably would not have caught the guy and got themselves killed one way or another by the way they're carrying on. I do love a vigilante type of cop but that's a whole genre and you gotta do it right. The traumatized cop is also a genre of its own, but this is not it.
Anyway, the killer bothered me too, I did not buy the motivation, his origin story, the reason he became unhinged. It doesn't seem strong enough. He also gets too many lucky breaks, or like I said, the guys in pursuit are just plain dumb exposing themselves like that. It's just unimaginative writing. The visuals are good enough, the acting is decent, we just needed better characters and story. Give this to the Scandinavians, they'll make a masterpiece of noir thriller. I mean they probably already made this movie.