This was a bit of a bloodbath. Only one character didn't actually die this week. Mind you, he's done his fair share this season...
"The Almost People", the second part of what we're going to have to call a three-parter now, involves two Doctors. As any long-term fan knows, the multi-Doctor stories are generally considered among the best in the show (with the exception of "The Two Doctors"...)
So having Matt Smith play against himself with the wonders of modern camera technology was a rather wonderful thing. The two played off each other brilliantly, with great dialogue and a rather wonderful twist that busted through Amy's prejudice. There were also good homages to the past and the first appearance of Tom Baker's voice in the new era.
Plot was well... a bit so-so. It involved a lot of machinery stuff, the acid (where is that coming from anyway - I know you don't get acid from the ground...). Some of the emotional stuff may have been a bit overdone in my opinion, but it wasn't too bad. Rory's sudden decision to lock up the Originals seemed a bit out of character to me.
We also got one of the old tropes of doubles; the "I'm not the evil twin! She is!" thing. I've seen variants on this going back to an episode of Are You Afraid of the Dark with Tia and Tamera Mowry way back in the mid-1990s and this was an interesting new one. Mind you, why would the Flesh dissolve like it? Surely, it behaves just like other matter.
Then we had the ending. Now, that's a game-changer. How long has Amy been, well, in that state? I suppose we'll find out.
Good episode with some great themes and a reasonable pace, boosted by a wonderful ending.