what are the most popular hbo series?
June 5, 2014 | 01:23PM PT. âGame of Thronesâ has whacked âThe Sopranosâ off its ratings perch. As the fantasy drama nears the end of its fourth season, HBO reports that âGame of Thronesâ is now the most popular series in the networkâs history. Episodes of the show, which first air on Sunday nights, have an average gross audience of 18.4 million viewers, according to Nielsen.