Over the course of those 15 years, it has become a fan favorite and a staple of television networks in syndication. Besides being the longest-running fantasy show to have ever been broadcast in the US, Supernatural is also considered one of the greatest fantasy shows of all time.No, not in terms of size or sheer numbers, at least not just. While ratings have been fine compared to most shows, viewership has been on a steady decline ever since season 11, with the 13th season averaging a 0.55 rating in the 18-49 demographic and 1.687 million total viewers, per TVSeriesFinale.
