'We make no apology. Don't expect to do the ironing; sit down, pay attention and think about it. Audiences like complexity.'
The BBC's Sherlock series has been praised for its cerebral spin on Conan Doyle's classic mysteries, while Doctor Who takes place on different planets and features an ever-changing cast.
Moffat added to BAFTA Guru: 'They [viewers] follow intricately plotted soap operas all the time. It depresses me when people say, 'It's all far too clever'.'
Sherlock is known for its mind games and fast-paced dialogue
He says he has no plans to leave the two shows at this stage but will know when the time comes to move on to new projects, revealing: 'The moment it's time to stop on a show is not an ambiguous feeling - you just suddenly think, 'I can't do it anymore; I've had enough'.'
Doctor Who's seventh series will hit our screens sometime in the autumn, while Sherlock's third series is not expected to appear until 2013.