Hey so yeah that was pretty good.
I mean it feel into some of the usual pitfalls RTDs writing has (like completely deflating any tension in a chase scene by turning it into a wacky comedy scene for no real reason), but apart from that, one of the best things to be (co-)written by RTD since the Eccleston days. We did however have Tennant doing his SHOUTING TO BE DRAMATIC thing a lot, and Murray Gold still needs to learn what subtlety is.
Plus I like the idea of The Doctor going a bit mad with power being the last only survivor of the Time war (except for all those other people who also survived).