“Grudge Match” finally puts the Raging Bull and Rocky Balboa into a boxing ring, though I fail to recall anyone actually demanding this showdown. It’s the gimmick that drives the movie, with plenty of inside jokes pushed into the pockets of the picture, but it’s not a particularly tempting offer. In dire need of a fresh sense of humor and imaginative screenwriting, “Grudge Match” is made passable by its two stars, Robert De Niro and Sylvester Stallone, who are amusing to watch as they trade insults and, eventually, punches, showing surprising interest in this limp dramedy, boosting the viewing experience with their innate charm. If only the rest of the effort followed their lead. Read the rest at Blu-ray.com