This may not be to everyone's taste, but if you are not upset by profuse profanity, if you don't mind coarse humour, if you appreciate a bit of moral ambiguity, and if you enjoy a dash of philosophy with your violence, then this is a movie you will love.
The film stars the great Brendan Gleeson, who has been quietly building a reputation for himself as one of the finest movie actors about, as a small town cop in Connemara, and the brilliant Don Cheedle as an FBI man arriving in Galway on the trail of a bunch of international drugs traffickers. But the whole cast is composed of some of the finest actors currently working, including Liam Cunningham, Mark Strong and Fionuala Flanagan.
At heart the film is a buddy movie about the mismatched cops Cheedle and Gleeson and in the midst of all the prickly dialogue between the two it satisfies all the expectations that one would have of such a movie with a great "shoot-em-up" ending. It also makes some nice subtle political points: in spite of the jokey xenophobia of the central character it is the foreign characters, Croatian, African and African-American who are, along with the character of Gleeson's mother, the most dignified and attractive figures portrayed; Dublin and Dubliners are the butt of many of the film's jokes, a nice counter-balance to Dubliners' tendency to treat non-"Pale" Ireland (ie the area that is not Dublin) as a lesser place.
If this film doesn't leave you with a smile on your face its difficult to know what will. Its great stuff!