About a year ago, the people who track TV ratings and the people who pay attention to them sounded the alarm: 18-34-year-old men, the most desirable advertising demographic, had stopped watching television! Millions of ’em! “Commentary abounded that a significant cultural shift had taken place and that a generation of men was steadily quitting television-viewing, forsaking both network and cable programs in favor of video games, DVD’s and the Internet.” Now, the young men are inexplicably back watching the tube. Were the Nielsen ratings wrong? Not according to Nielsen. But several critics of the system say otherwise.