Quote: Matthew Stott @ September 24 2012, 4:32 PM BST
Neither was Moffat, but he certainly managed a few great Who stories. You don't need to be a 'proper sci-fi writer' to write great Doctor Who episodes, just a great writer.
With an emphasis on the few. I think if you want to compare Doctor Who to any other sci-fi show, then Quantum Leap seems to be the most similar. Every week was a new situation, a new set of characters, a new setting in time and a central character that brought about resolutions.
Based on some of the episodes of New Who, where wishing things better or waving the magic screwdriver makes everything good again, writing it would be a piece of piss.
EDIT: Almost forgot about Sliders, which also had lots of groovy alternate histories and brand new worlds.