This movie feels very realistic. The life of this serial killer is portrait without much glamourization (no lively red spreading everywhere). Many of the killing scenes are not shown. There isn't much space for victims being tortured, screaming for help.
The lack of shenanigans makes the movie very creepy. It makes the movie quite immersive.
Also, the characters are quite broken people with very tough and sad stories. That gives the movie another note of complexity.
I definetely recomend it.
