I thought this was a great standalone. It's funny how people complain when there are arc episodes and they complain when there are standalones. Guess folks can't make up their minds. Remember, if all they focused on was the arc we wouldn't have had The Doctor's Wife a few months back.
I don't think it's unfair for the series to demonstrate some emotional realism. The poster on Gallifrey Base who called out the episode for Amy and Rory's "callous indifference" to the fate of Baby Pond was bang-on. Just because they spent their whole lives as best friends with their own daughter and they've seen what happened to her doesn't mean that they shouldn't be grieving for their loss and railing against the Doctor for it happening.
And no, the argument that the episode was made to go in the first half of the season doesn't wash. They did pick-up shooting for "Let's Kill Hitler" as late as July. They could have done pick-up shots for "Night Terrors" to better represent the emotional beats of the post-"A Good Man" storyline.
The only thing I can figure is that there's a great whacking difference between what the audience thinks the series is about and what Moffat thinks the series is about.