I agree with Ghost Bones; this could easily have been an atrocity on the level of "A Good Man Goes to War," and it wasn't.
I keep hearing this, but I don't see what was so wrong with A Good Man Goes to War"
The episode didn't live up to its promises. It wasn't the game-changer Moffat said it would be. It didn't have a jaw-dropping cliffhanger that Moffat said it would. It's boring, it's talky, it pretends that it's more portentious than it is, the emotional implications of the episode are never dealt with, and for a midseason finale it's a structural failure.
Basically, it's a slickly produced piece of crap.
And yet, it's my absolute favorite episode of Doctor Who ever made, so


. Probably the ONE thing RTD did right in his otherwise atrocious treatment of the Time Lords was make them an all-powerful force. Swiftly stopped by a deus ex machina of course but otherwise very powerful.