Watched it tonight, awesome to go out to watch a movie with the wife and friends, an experience that becomes really rare once you have kids.
It's definitely a very enthralling psychological thriller. I found it very refreshing. Great to see some originality for once, the "anti-hero" genre isn't new per se, but the way the character development is written and you see this guy going from a looser to a nihilistic psycho is really well done.
It's not for everyone, for sure, it goes into places few dare venture, for good reasons, and I applaud it for trying.
I can now understand why it got some hate from certain reviewers, because whether you want it or not, you'll find yourself empathizing and feeling pity for a "monster", because it shows you how he got there, he was made not born, and that's a real uncomfortable thought for many, for sure.