I really dislike this movie. I will take an extract from Bobby Roberts's review (who put it better that I can):

Paul Haggis (the writer) had his car stolen from him one night, and like most sane people who are robbed at gunpoint, he went home and wrote a sympathetic screenplay about his attackers. In Haggis's case, "sympathetic" means he turned them into Heckle 'n' Jeckyl, and wrote everyone in the film to be shrill, stupid stereotypes hiding their prejudice under a thin veneer of sophistication