Mass is a type of film many people today, wouldn't call a film. Even my father didn't see this as a film but rather as a documentary. The dialogues and the performances are that good. I wouldn't call acting in this film masterful or magnificent. I would just call it real, not realistic. Real. It didn't feel real because if someone were to tell me these things had happened and that they aren't acting I could have believed them. This "film" is not for everybody and that's why I am keeping this review spoiler-free so you go in with the right expectations. This isn't a play like 12 Angry Men. What I mean by that is this doesn't feel like it was written by someone. I would even say this is a lesson on "basic" writing. You put people in a room and you just let them talk. This film does that extremely well thanks to its not phenomenal but "real" cast, meaning performances weren't exaggerated. There is a lot of silence, lots of subtle details and when you start to recognize these things you realize that this may as well be one of the best acted films ever. The writing on the other hand knows how to continue the dialogue which I think is extremely hard, getting from one topic to another especially in the beginning. The writer does that with such ease that the dialogues don't feel scripted. The film is heavy but it doesn't overdramatize which for some people can be a bad thing as it can feel like it is "too real". If you want to see a too real table dialogue between 4 "real people" then watch this film.