The cinematography, the acting and the cast were the main good points of this film. The colours were amusing, the presentation of the dead bodies were naturalistic, the mode of killing and the motivation behind it was well constructed so it surprises even me why I feel that the story itself with its nonsenses could bring down such a good movie to this average rating.
According to my knowledge gained by watching crime documentaries there were some points that simply does not made sense at all: while completing the autopsy of the body it was not tested that the parts were from one single body or not, during the trial of the culprit's sister death a second autopsy was not suggested to solve the pending questions of the family, the evidence could not be fabricated or changed that easily. Especially if the forensic scientist was so respected and capable like it was shown in the film, he would not be that careless that he would skip checking wether the DNA collected from all the pieces of the body were matching or not.
It felt like the environmental issues mentioned were put aside really quickly even though it seemed like the culprit was extremely obssessed with the "Venus concept" of that river.
P.S.: Yes, I am obssessed with crime documentaries especially with serial killings.