This movie was very strange in some ways, but generally pretty good. The relationship between J and Gilly (and the things Gilly seemed to allow) was quite believable. Dunbar was quite chilling (he's almost always good). Prepare to shake your head at some of the more extreme directing choices but pay attention to the performances for some small, but key players: Jamie Sweeney as J's kid brother, Gerard Butler as a psycho bad guy (his first) and Melanie Lynskey as J's wife are all among the best things in the movie. It is well worth watching if you enjoy the British style of violence and humor from such movies as The Krays or Snatch.
