Despite competition from Fox's telecast of the American Country Awards, which averaged 7.4 million viewers, CBS's comedy lineup dominated the ratings Monday night, topped by Two and a Half Men , which drew 15 million viewers, followed by Mike & Molly , with 12.7 million. ABC's A Charlie Brown Christmas at 8 00 p.m. scored with 9.1 million viewers and Castle drew 8.1 million at 10 00 p.m. But NBC's ratings looked anemic, particularly those for Rock Center with Brian Williams at 10 00 p.m., which could only attract 3.4 million viewers.