I think all of this can be put down to RTD wanting things to go out with a bang... exactly like how he ended last series. And the series before. And the series before that. And the next two specials...
I must admit that for a moment I was hoping that the Doctor would stay on his power trip - it would be a wonderful start for the next Doctor. But no...
As for the episode, I thought it was decent. I liked the design of the station (although at least one of the sets looked like it was reused - the view of the glacier was so similar to the giant whatever-it-was in the episodes on the planet of the Ood), and I liked the return of his spacesuit (from the two Satan Pit episodes). Oh, and I feel like I must comment on how his sonic screwdriver was very nearly just a screwdriver (albeit a sonic one, and one that can somehow add rockets to the back of robots...).
The bits that let it down, for me, were the speeding robot, and when the Doctor came striding back in all triumphant-like, and decided that he wasn't going to die because he's suddenly bound by a prophecy.
Saying all that, it was head and shoulders above the terribleness of the Easter special.
I can't wait for everything to be handed over to Moffat. Sure, I'll sit through the spectacle that the Christmas specials are guaranteed to be, clap my hands in the right places, and enjoy the eye-candy, but I'm getting tired of RTD's vision of the Doctor, and how it's being tailored to the younger audience who like flashy explosions, happy endings (though I must admit that tonight's suicide was a bit adult - brings back memories of Torchwood. Oh how long ago that seems
), people being turned into little goblins by laser screwdrivers, goblins being turned into super-beings when their name is chanted, and people flying away in bloody buses...
/rant
As is often used to describe Goodkind, I'll use the old MacDonald analogy - tonight's episode was satisfying in the way that a MacDonald's is satisfying. It fills that hole, but in a greasy, cardboardy way.