Not all Christmas movies are heartwarming, like "It’s a Wonderful Life," "A Christmas Story," or "Die Hard," for that matter. "Bad Santa" is a rude, crude darkly comic tale that just happens to take place at Christmas. Don’t believe the commercials that make this look like "The Santa Clause III."*
Having said that, I found "Bad Santa" to be a brilliant dark comedy that stayed true to itself to the bitter end. There were no good guys, no one was redeemed and everyone got what they deserved. It was funny but it wasn’t pretty.
*Seriously. Don’t even think about taking the kids.