It was... ok.
I say this as someone who has become a big fan of Who of late. I have all the box sets and have watched them more than once. RTD got a lot of stick, unfairly I think, because he was carrying on a legacy of Dr Who vs the Big Bad that was started back in the days of Terry Nation et al. There was some very, very fine writing in Series 4, and I don't mind admitting that I thought Tennant's final scene was, although somewhat self-indulgent, played to perfection.
Moffat's writing was brilliant during RTD's reign. Blink remains one of the finest episodes of Who ever, with Moffat's "timey-wimey" stuff kept in check by the insistence that crossing your own timeline is on a par with crossing proton streams. "That would be very bad, Ray."
In "The Waters of Mars" there was a moment in which the Doctor realised that, as the last of the Time Lords, he was the one who had the rulebook and so he could do whatever he wanted (except it didn't quite turn out the way he thought it would). It would seem that Moffat is taking that concept of him being the last of the Time Lords and running with it -- all that "time can be rewritten" stuff.
The problem with that is that he's using time travel as a Macguffin that renders the Doctor practically omnipotent. Time can be rewritten. Memories can be rewritten. What's to stop him doing anything at all? There are no fixed points in space-time that absolutely must happen -- there won't be another Pompeii for the 11th Doctor. It has gone a bit Bill and Ted, and while I enjoyed the bits of the series finale that showed parts of earlier episodes in a whole new light I did find the overall approach unsatisfactory. It felt like an alternate universe Doctor Who. It felt like fanfic.
This was particularly clear in the Christmas special. It was... meh. It didn't get the balance of kid-friendly but watchable by adults right, IMO. I didn't have a problem with flying fish so much as I had a problem with flying fish that were either freshwater fancies or a bloody great shark. I can suspend disbelief as long as a writer doesn't keep throwing incongruent details in my face, which is why the over-use of familiar things as a way of helping the audience identify with the story can be a major problem. There was also the issue that the crises faced by the Doctor in his new era of omnipotent time-rewriting are artificial, contrived and largely implausible; and therefore have artificial, contrived and largely implausible solutions.
I was really looking forward to it. I made it quite clear that we were going to watch it, whether everyone else liked it or not. I too fell asleep while it was on (and had to catch up on iPlayer). I haven't quite decided what to make of the shark that was a clock-eating crocodile in disguise, although I'll bet Michael Gambon didn't expect to be playing a romantic lead again any time soon.
There were good points and bad points about it. I loved Tennant's Doctor and was very sad to see him go, but I do like Matt Smith's portrayal, even though he hasn't yet quite showed the same dark depths and hint of danger that he needs to be believable as someone who can make entire armies run away.
Sam