for What's New, Scooby-Doos Mindy Cohn in the "Outstanding Performer in an Animated Program" category. Science advocate Carl Sagan favorably compared the predominantly skeptic oriented formula to that of most television dealing with paranormal themes, and considered that an adult analogue to Scooby-Doo would be a great public service. Scooby-Doo has maintained a significant fan base, which has grown steadily since the 1990s due to the show's popularity among both young children and nostalgic adults who grew up with the series. Several television critics have stated that the show's mix of the comedy-adventure and horror genres was the reason for its widespread success. As Fred Silverman and the Hanna-Barbera staff had planned when they first began producing the series, Scooby-Doos ghosts, monsters and spooky locales tend more towards humor than horror, making them easily accessible to younger children. "Overall, [Scooby-Doo is] just not a show that is going to overstimulate kids' emotions and tensions," offered American Center for Children and Media executive director David Kleeman in a 2002 interview. "It creates just enough fun to make it fun without getting them worried or giving them nightmares. Older teenagers and adults have admitted to enjoying Scooby-Doo because of presumed subversive themes which involve theories of drug use and sexuality, in particular that Shaggy is assumed to be a user of cannabis and Velma is assumed to be a lesbian. Such themes were pervasive enough in popular culture to find their way into Warner Bros.' initial Scooby-Doo feature film in 2002, though several of the scenes were edited before release to secure a family-friendly "PG" rating. Series creators Joe Ruby and Ken Spears reported that they "took umbrage" to the inclusion of such themes in the Scooby-Doo feature and other places, and denied intending their characters to be drug users in any way. Like many Hanna-Barbera shows, the early Scooby-Doo series have been criticized at times for their production values and storytelling. In 2002, Jamie Malanowski of The New York Times commented that "[Scooby-Doos] mysteries are not very mysterious, and the humor is hardly humorous. As for the animation—well, the drawings on your refrigerator may give it competition." By the 2000s, Scooby-Doo had received recognition for its popularity by placing in a number of top cartoon or top cartoon character polls. The August 3, 2002, issue of TV Guide featured its list of the 50 Greatest Cartoon Characters of All Time, in