Doctor Who can be complicated at times, it absolutely can be — but it’s supposed to be. You’re supposed to pay attention. I’m also addressing children, hugely the case in the U.K., and children are demanding of complexity. So no, I don’t think it’s true. I think we do some complicated stories, we also do incredibly simple stories. I always think this: I don’t care if it’s complicated or too scary or too grown-up or too childish or whatever they are saying this week, so long as they never say it’s too boring. If anyone says “Oh, it was a bit dull this week” is when the show will start to die.
Steven Moffat Talks Doctor Who, Sherlock — Vulture