A unique portrait of a serial killer [spoilers]
I spent a lot of the film wondering how a psychiatrist would diagnose Milo: Autistic? Antisocial Personality Disorder? Whatever the case, Eric Ruffin did an excellent job portraying a creepy yet deceptively innocent kid, and the movie kept me hooked as I tried to figure out how his mind works.
I have to wonder how Milo got away with his killings for so long, though. He left DNA evidence in the form of saliva on each one of his victims, and there are security cameras everywhere in NYC that would have caught him leaving the bus station, leaving the park, etc. Plus serial killings are high profile; there would have been a massive manhunt for whomever was killing all these random people with a pen knife to the neck, with tons of media coverage and a huge task force. Killings like this don't just pass unnoticed.
In any case, despite the lack of realism in the response to these crimes, I really enjoyed the movie for crafting a character who's impossible to understand but drove me to want to understand, who disgusted me a great deal but also somehow got me to care about him.