Comedy?
I had a hard time finding this movie funny, mostly I think because of the tone that was set by the opening scene and sequence.
Also, the ending does seem like a bit of a copout. I read that they redid the ending because the original ending didn't test well.
Overall, I liked the movie well enough but I think people who love the movie would mostly be middle aged men who identify with Mad Dog and are experiencing a little wish fulfillment through the movie.
BE YOUR OWN FANBOY