Y'know, I think what makes the Weeping Angels stand out as much as they do is the fact that they aren't typical science fiction monsters. They're horror movie villains. Nowhere is this more apparent than in this two-parter.
The second episode of this story sees the Doctor, Amy, River and the clerics being menaced by the aforementioned angels, which by this point stand as strong candidates for "scariest Doctor Who
monster of all time". However, as was hinted in the trailer, there are worse things than angels afoot, as the nature of the crack in Amy's wall is finally revealed.
It's an ambitious concept, but I think Steven Moffat
pulls it off with aplomb. This is the episode which properly introduces us to the overarching plot which will presumably be the basis of the finale. It also pushes the characters to their emotional limits, with Matt Smith
putting on a stunning performance as a Doctor in a terrible and desperate situation. The pacing is good, the dialogue is fantastic, and there's a good balance of sad, happy, funny and scary moments.
My one, minor (and admittedly rather nerdy) complaint is the damage that this story looks set to inflict upon the series' continuity. I'm a little unsure what the implications are with regards to the spin-off series. As with "Victory of the Daleks", this episode feels in some respects a pointed rejection of the Russell T Davies
era and a sweeping away of the old to make room for the new; whether or not this is a good thing will probably depend on how you felt about RTD's take on the show.