Well, what a mess this was? From almost every conceivable viewpoint. The story drew from everywhere with shit being thrown around all over the place, only to serve the purpose of making it look interesting and complex when really they just took the most blatant fixes they introduced to be fixes this year (so blatant I would have bet money the tesselector was a red herring) and tied it all up in a very flat, boring and unconvincing manner.
Then the editing. Jesus Christ this episode was horrible to actually watch, with the first half of the entire episode acting as a "previously on" of previously unseen segments. And then the second half being random action where no one remembers who they are and the big bad guys they gave a great intro to in the first part of this series being resigned to just random henchmen who shoot electricity. There was nothing creepy or scary about them, they resorted to being used as evil Ood.
And then just the style of the episode, my god, did they run out of money or something? Look at this episode next to the opening of the series. Fuck me but the blatantly CG'd shots of the doc and river in the suit at Lake Silencio were terrible, not to mention the rest of the episode looking about as stale and wooden as a 70s ep of the show! Even when you see this ep compared to the Pandorica Opens, it still looks far far worse. Toby Haynes did an amazing job on Pandorica, and the two part season opener this year, why they didn't give him the job again is beyond me.
I'm sure there was a good episode here somewhere, but it was buried underneath layers of unnecessary glitz and crap that just bogged down the story so much...urgh. Why did River change the timeline? How could she?! What the hell actually changed in that time of her life that allowed her to make that change?! NOTHING! She always must have had that life she had (that begun in Nazi Germany) and always ended up killing the doc at that point in time, so, how come she killed him the first time straight up but just changed her mind this time? That's how this was presented right? Like it happened just before on Lake Silencio, that Doc had lived the same life this one did....