Those two shows you mention, they were designed to be comedies. They were craeted to make people laugh and nothing more.
KRDK was created to be a drama for an audiance slightly older than the on PR targeted. Now if you watch any drama, yeah there's the occasional funny moment, or comedic character(in fact KRDK had one as well Aunt Gracie but most of you complained she detracted from the show) but it's kept to a minimum in most cases because the creators know the audience isn't watching the show to get a laugh.