So, yes, okay, that was a Very Good Episode of Doctor Who.
And more than that, it was a really good Part 1 episode. It spend the entire time building up to something fantastic at the end, and then every twist - like Rory popping up- was twisted with him being an Auton.
Speaking of, it's great to have the RTD style 1,000,000,000 aliens but have them actually have a plan that isn't "DESTROY THE EARTH FOR REAL THIS TIME", and it's even better because they actually managed to beat The Doctor. Plus, and this is something I really liked, when they said that everyone was coming, they meant everyone. Draconians, Zygons, Tararetils, you name it, class and new series monsters. In RTD's time you got the feeling that you had the new series stuff and then the old series stuff kept waay seperate. Now it really feels like it's all one big thing.
There were times in this episode that I am so happy Matt Smith is The Doctor. He just plays it SO WELL. Same with Karen, really.
And of course what will be interesting next episode, obviously the Daleks, Cybermen, Sontaran's et al's plan was to just imprision The Doctor, and they themselves have nothing to do with the cracks - so next episode hopfully we'll see them all go "OH SHIT THAT DIDN'T WORK" and find out who or WHAT the Silence is.