Movie Review - A History of Violence

I have no idea why I rented this movie other than the fact that it said, "The Best Movie of the Year" on the front. Whoever says that is on drugs. The plot had promise: a man in a small town becomes a hero when he saves several people from armed robbers, his newfound fame finds him then being "mistaken" for an ex-mafia member so the mob comes to take him out, then we find out he is ex-mafia and he kills everyone. The problem was the acting was terrible, the killing scenes were not all that cool, and the movie ends abruptly with his family hating but accepting him. I give it a C+.