Amazing stuff. It sounded underwhelming when I read the plot, but it was just lovely seeing it. It felt like the most captivating episode in the season, or perhaps second after Asylum of the Daleks.
My only complaint: I wanted to see how Clara became a Dalek in AotD. To see how her choice to go inside the timestream had grim consequences for her. It must have been one hell of a moment for her. And one hell of an emotional scene in there.
Another thing, was John Hurt's Doctor always the intention or a last minute cop out? Although it does sound like the latter, the ninth never felt as affected by those terrible things, it is a fitting retcon. Although I would have preferred to see Eccleston in the part (as much as John Hurt will probably be an excellent Doctor).