While the television show "Downton Abbey" does have lighter moments of humor and frivolity, the show is officially classified as a drama. This is due to the fact that the majority of the show is more serious than humorous.
Since the show debuted in 2010, "Downton Abbey" has been successful. It quickly developed a cult following, and it has remained consistent both in terms of the writing and the acting. While there are many humorous moments on the show, the overall character of the show is that of serious drama, and this has allowed the actors, such as Maggie Smith, to shine.