I enjoyed the complexity of this mystery - lots of suspects, interesting motive. The POV changes a lot between Hole, victims, and other side characters, which took some getting used to. I didn't feel that all the POV changes were necessary - sometimes the story seemed to drag. 

Of the Scandinoir I've read so far, Hole is one of the more archetypical detectives - living for the obsession of a case, searching for a worthy adversary, self destructive without the case.

Some spoilery comments:

I was a little irritated by how often they picked a new suspect with confidence, even if Hole was always consciously or subconsciously suspicious. I also found the Katrine subplot irritating, just because I was hoping for a female character that wasn't just there for victimhood, romance or hysterics lol. The mold guy red herring was funny though.