Ok, I liked that episode but at the same time there were so many things about it that didn't make sense or just didn't really work that I find it hard to justify my liking of it; I think it would have benefited enormously from being a two-parter (like last week's should have been), since there were so many features of it that could have been better explained or expanded upon. A few examples (spoiler ahead obviously):
-The statue of liberty ended up doing absolutely nothing other than be a somewhat menacing visual gag (plus how was it even able to move when, as the doctor said earlier, it's in the city that never sleeps and there's bound to be someone looking at it at all times, even at night).
-After Rory was displaced, he literally just walked into the hotel for no reason, which is just supremely lazy writing (with a two parter I doubt it would have been too difficult to come up with a reasonable motive)
-The angel at the end, aside from not having any reason to be there given that the paradox eliminated any reason for the angels to be in the city, could not possibly have sent Amy back through time since the Doctor and River were looking right at it when she turned around. Seriously Moffat, how hard would it have been to get Amy to convince the Doctor and River to turn their backs on her so that she could be with Rory? Instead we end up with a scenario which completely ignores the fact that the angels can't move if someone's looking at them.
-The collector character was really badly developed and felt like a rehash of that guy from the series one episode 'Dalek'. Plus, he just had Rory put in the cellar for no reason at all, which was a real dick move on his part (and River let it happen, too)
I don't want to come off as excessively nitpicky, but I just can't ignore how weak some of the writing in this episode was. Fortunately there were lots of good things to counterbalance these: the Ponds' sendoff was handled well, as was the scene on the roof; I liked the use of the book, which was a clever little device; the Doctor's frustration with his inability to do anything was really well conveyed throughout; I like how unprepared and confused Rory was since he'd never actually come across the angels before unlike Amy, etc etc.