Yes, this movie is a must see!
For me this movie was all about contradictions.
As you can see below, the official website of this movie is also like a billboard with all the winner! signs.
When the Ebbing, Missouri Police Department is unable to solve her daughter Angela’s murder, tough-as-nails Mildred Hayes (Frances McDormand) decides to make a bold move. She rents three billboards leading into the town and paints controversial messages on them pointing a finger at police chief William Willoughby (Woody Harrelson) ineptness.
The billboards seem to get under the skin of several of the town’s residents, but Mildred is plenty capable of taking them on. When the chief’s second-in-command Officer Dixon (Sam Rockwell), an immature mother’s boy with a penchant for violence, gets involved, the battle between Mildred and Ebbing’s law enforcement is only exacerbated.
Nice detail i read on IMDB:
The bandanna Mildred wears is an homage to The Deer Hunter (1978), of which Martin McDonagh and Sam Rockwell are avid fans. During the filming of Seven Psychopaths, they often discussed the movie with its star Christopher Walken.