Over the years, The Big Bang Theory became one of the most-watched and highest-rated TV shows in the United States. The show's finale, which aired in 2019, was watched by over 18 million viewers, making it one of the most-watched series finales of all time.
The show's characters are also well-developed and complex, making it easy for fans to become invested in their lives. The show's relationships, particularly the romance between Sheldon and Amy (Mayim Bialik), are well-written and nuanced, adding depth to the show.
The Big Bang Theory premiered in 2007 and initially struggled to find an audience. However, with the help of positive word-of-mouth and critical acclaim, the show slowly gained momentum. By the end of its second season, the show had become a ratings success, attracting a large and dedicated fan base.