“The Nights Before Christmas” (*1/2 out of four) was a good-looking but gory, heavy-handed horror show about a murderous Mr. and Mrs. Santa Claus (Simon Phillips and Sayla de Goede) who go on a holiday rampage and have to play a cat-and-mouse game with the F.B.I. (led by Ken Bressers) who are trying to put an end to their reign of terror. Reasonably well-made but otherwise doesn’t have much distinction from umpteen other holiday-themed horror bashes and runs out of energy pretty early; maybe “Silent Night, Deadly Night” wasn’t as bad as everyone thought all those years ago.