"Project X is a detestable little film, and that's frankly if you can even call it that, but it barely has enough plot to fill a two-minute trailer, let alone a feature film. What passes for a script here probably amounts to about ten pages tops, half of which are references to much superior films in the genre. Every single thing about the movie is ugly, from the nasty pustules passing for characters, including Costa, possibly one of the worst seen on screen in the last ten years, to the camerawork due to its badly executed found footage gimmick. But by far the most ill-judged thing is its tone. This could have made a terrific social parody if they actually showed the consequences, but the film depressingly plays it straight, and actually endorses and celebrates the increasing depravity, and even encourages emulation to top the partying bar. And to cap it all, the party just looks overcrowded and crappy. This is basically a vile film that seems to be aimed at sociopaths and pricks, and is skin-crawling for all the wrong reasons. I mean if you want to go to a party, you don't have to live vicariously through this movie. Just go to one. I guarantee you'll have a much better time."
— Film Brain, during his review of the film