Watched this on iPlayer last night and I thought it was a very weak and derivative story line. I agree with SP about the arc of the narrative being laid on thick, and the morality tale of the last episode may as well have been written in ELVIS style lettering at the end of the show.
Too often this new crop of Dr Who script writers wear their influences on their sleeve. I don't think there has been a sci-fi film of the last thirty years that hasn't had it's ideas, scenes, dialogue or imagery plundered in the form of a 'tribute'. It's beginning to grate on me.
Having said that, I think young Smith is doing really well, he's inhuman which is right and proper. I liked his irritation toward the end of the episode when he said 'humans have nothing worthwhile to say to me today'. That was pretty much my view by then, as Amy Pond seems very much like lightweight eyecandy, and she comes across as a bit dim in real life too.
As for a black Queen of England? Please...that kind of PC nonsense was a RTD trademark, and it makes me cringe.