Originally Posted by Kapellmeister:
“I thought it was creepy and sinister. She was literally old enough to be Smith's mother, and it showed. I never once believed in their 'relationship'. It might've worked with another actor but Moffat should've left the whole River Song thing out until he had an actor playing the Doctor that would make it believable and not toe-curlingly embarrassing.”
Before Series 5 that was my biggest concern. Hearing that we were getting the youngest actor to play the Doctor and then the first set pics being with Alex Kingston, I really didn't know what they were thinking and thought it was a mistake not to cast an older Doctor.
But it's one of the few things where I think Moffat hit it on the head, and came up with something better than I would have ever thought of. Matt Smith might have been in his twenties when he first appeared alongside Alex Kingston, but his character was nearly a thousand years old. "When one's in love with an ageless god who insists on the face of a twelve year old, one does one's best to hide the damage"... remarked River in
The Angels Take Manhattan.
It was an absolutely fascinating dynamic that I thought was typically quirky of Doctor Who - it wasn't just a soapy romance, it was timey-wimey and crazy. The fact that Smith could act like an old man in a young guy's body simply added to those layers for me. Perhaps it all depends on your opinions on large age gaps in relationships, and perhaps the outward appearance of people in a relationship matters too much to some people - the fact you describe it as 'creepy and sinister' is very telling. But I think the chemistry between them was brilliant and different. No matter how good Capaldi and Kingston are as actors, they wouldn't be able to replicate that sort of dynamic for me.