I'll say this was an interesting story. Adam Sandler's character was well developed and it was easy to feel how tortured he was. His performance was great as well. The anticipation and chaos build-up was also well done and made you feel really uncomfortable for the entire movie(which could be considered good or bad depending on who you are).
That being said this movie was not at all enjoyable to physically watch. Most scenes were just people screaming at one another and the length of the film could have been shortened considering how many scenes were the exact same thing. At the end of the film, I left the theater feeling extremely uneasy and wishing I brought earplugs.
Maybe this is what the director was going for? If so- well done.