Spoilers follow, and in fact, I haven't recapped the plot (mostly because, to be honest, I'm not actually sure that I followed it) so none of this will make any sense if you haven't seen the episode.
OK, first things first - my excuse for blogging this, aside from the odd Roman, is that River Song is an archaeologist, so let's look at that. I love her slightly Indiana Jones-y outfit - in fact, she was very much a female Indiana Jones throughout this episode. Since we haven't yet met a version of River who doesn't know the Doctor, this is less out of place than usual, as an archaeologist who may or may not be married to the Doctor is much more likely to be handy with a weapon and up for some action adventure than your average university lecturer. I especially loved her totally brutal, cold-hearted annihilation of the Dalek who killed her lover - perhaps she is Steven Moffat's version of Captain Jack, who can be the tough guy with a gun that the Doctor can't be.
I loved the Pandorica and the battered Dalek ending up in the museum, though I thought calling it 'The National Museum' was pure laziness - why not just mock up a couple of rooms from the British Museum and add some stock exterior shots? I loved the timeline of all the things that had happened to the Pandorica through the centuries as well - that felt like a very 'real' touch - and every time anyone mentioned the story of poor Plastic!Rory guarding Amy for 2000 years I welled up. The image of the Roman centurion running from a World War Two bomb was strangely awesome and powerful, though unfortunately it did lead me to wonder why he waited until World War Two to change his outfit.
(Edited to add: It appears that the 'National Museum' is in Wales - I've never been to Cardiff, which is presumably where it is, and hadn't heard of it. Depending where Leadworth is, that could be a more sensible location but I confess, even though I live in Wales at the moment, I'd still rather have seen the British Museum, there's no museum quite like the British Museum!).
As for other, non-history related things...
The plot made no sense. Maybe when I've watched it twelve times, like an episode of The West Wing, it will all come together and everything will be logical and sensible, but on first viewing (which is the viewing that counts, really, as if you don't enjoy it the first time, you won't bother watching again) none of it makes any sense whatsoever. I think the two biggest issues were, 1) Surely a universe without the Doctor will be a very unfortunate universe? With everyone being overrun by Daleks and so on? This is a very bad plan! (OK, the universe is in dire peril, but still). However, Dad then reminded me that actually, if I recall my nerdy internet reading correctly, Doctor 4 was at least partially responsible for the emergence of the Daleks anyway, so maybe the universe will actually be better off without the Doctor causing all the problems he then goes on to solve. And, 2) how exactly can the Pandorica bring people back to life? For much of this episode, it seemed like it was just a slightly updated version of the Goa'uld sarcophagi from Stargate.
There was also a distinct lack of tension, due to the fact that I know the show isn't ending, so the Doctor will be fine. All through the lovely, tender scenes with Amy and Amelia, I just wanted him to get on with it so I could see how it all resolved itself and get to the much, much more interesting questions - what's going on with River? When will she marry the Doctor? Who did she kill and, presuming she killed the Doctor (since she said it was a very good man, seems a bit obvious but it could be him) when will she do it and, most importantly of all, if she kills him, will he finally regenerate into Adrian Lester like I want him to?! Most of which, it seems, we'll have to wait for Christmas, if not longer, for answers. I wasn't quite sure whether I liked that the bigger story - including the 'silence' - isn't resolved yet, or whether it was annoying. On balance, I think I liked it, as it gives us all something to look forward to, though a couple more answers, or hints, in this episode might have been nice.
I liked Amy and Rory's happy ending a lot (SO happy that Rory is properly human again!) and loved Rory as 'Mr Pond', though I worry for poor Rory's safety. I love the idea of a married couple on the TARDIS, but how can the writers resist the urge to kill him off again? The Doctor's comedy dancing at their wedding was pretty cool, though no Angel.
Other random thoughts... Not sure about the ‘wacky’ music. No, Doctor, no one is listening to you because you’re making absolutely no sense whatsoever. It’s all getting a bit Time Traveller’s Wife again. ‘It might even work’ says River – yes, if it’s a million to one chance, it might.
We end on a couple more history related notes. The Christmas special may or may not revolve around an Egyptian goddess loose on the Orient Express... IN SPACE! Which could be cool. And Amy's father is called Augustus.... why, why, WHY??!! (I would like to finish on a snarky note, but just watch Steven Moffat, the Structure King, somehow tie Amy's father in with Father Octavian and make me sound like an idiot...)