This review does contain spoilers, the events in this series are based on factual events so history is also a spoiler.
What's most fascinating about this series is how we see an in the flesh Patrick Bateman-esque character unfold, how he almost perfectly planned the events of his life around a series of movies he watched, and that's about it really, everything else is just fluff around the edges to extend what could/should have been just one episode.
The problem with this series is that it adds dramatization to areas which simply aren't dramatic, a character even likens their anticipation of another cat murder video to that of the anticipation/anguish felt during 9/11 which is a bit pathetic in my opinion given the sheer number of lives lost during 9/11 compared to a group of people sitting behind screens watching videos.
The scenes of Facebook were simply cringe-worthy, how people would spam one another with CCTV links from other countries and have some sort of accomplishment when it was the police who made more ground-breaking progress in one day than the Facebook group made in 2 years.
The determination and detective skills that these people showed was indeed impressive, but they would have made absolutely no progress if it weren't for the person who gave them Luka's name (that person, I bet was Luka himself, given how narcissistic he was and how much he loved the attention). Let's also not forget how this group complained to police, with the main character talking about how she "let them have it" on Twitter (great progress, really well done *sarcasm*), because the police "didn't listen to them" - yet these were the same people who allegedly played a part in somebody committing suicide because they jumped the gun with absolutely no evidence.
TL;DR: If you're interested in the story without the dramatization and almost pathetic victimization of the main individuals then do your own research, reading & psychological profile on Luka Magnotta.