Although I never took classes like these, I found that the classes that sounded like they were fun and would be "fluff" classes often ended up being among the most difficult due to the in-depth nature of the course. It's not like they are sitting around watching Trek episodes, they are probably looking at the cultural experiences that brought about the issues in the episodes, comparing them to historical events of the time, and looking at the social phenomenon that lead to the shows, and what lead to the longevity of the shows long after they ended. All valid topics for sociology or history classes.