>>Last week's episode about Agatha Christie was the worst I've ever seen.<<
I would say that Voyage of the Damned was awful, Partners in Crime wasn't much better, and The Unicorn and the Wasp was a wasted opportunity (the trailer looked great, but the episode itself was disappointing).
I thought last year's finale with the Master was too easy (throw a big level and turn time backwards - a liiiiiiiittle too easy!). I didn't care much for the way Davies wrote the Master either, though John Simm was more than competent.
Russell T Davies did a great job in re-imagining Doctor Who. People who hated the original series now find the concept accessible never miss an episode. His best offering as writer, I think, is The Parting of the Ways (Eccleston's last episode for those who don't know the titles).
In this year's series, so far, I loved Planet of the Ood and enjoyed The Sontaran Stratagem.
I was getting a bit weary of Davies dropping in references to his own world view whenever he could. If I did that with my writing, I would be accused of preaching. All writers draw on their preoccupations, but in an ongoing television series it becomes very obvious if it is not curtailed. Hopefully Moffat will restrain himself when it comes to it.
Steven Moffat is a different writer with a different world view. His stories have been the best. With him in the driver's chair, I am daring to hope Doctor Who will see a return to form.
Will.