Well, there are humorous moments but it's not a comedy. I find the casual violence in Tarantino films disturbing but this film has plenty of violence without coming anywhere near Tarantino in quality. Crude stereotypes abound in all directions.
It seems to be a quick cash-in on current events in the USA. The music is frankly lazy.......how long can you hammer one key on a piano? The only redeeming feature of this film is that it makes both 'sides' look equally absurd and ineffectual. Lesson learned.....if the Guardian gives a film 5 stars, avoid it.