Also, did anyone else get an Israel/Palestine vibe from the Doctor's conversation with the Silurian? Found that parallel a little uncomfortable myself...
I got saw a bit of allegory going on there too. Although I didn't feel uncomfortable about it. It's a perfectly legitimate issue for this story to deal with given the context.
As for the episode itself, I enjoyed it. It did look underpopulated and there wasn't enough story to fill the episode. IMO moving the action to the Church was unnecessary and counter-productive. The whole thing could have taken place in the mining complex which could have really played up the isolation and foreboding that this story was clearly trying to convey.
If I were judging this episode on its own merits I'd say it was a little below average. But since it's the first episode of a two part story I'll withhold my final judgement 'til then.