My personal reaction was - "Finally! A well written and acted episode and it only took them eight episodes to get there".

For me, it was the best so far. I didn't think "The Fires of Pompeii" was as good. Certainly that and "The Planet of the Ood" were enjoyable compared to all the others (particularly the excreable episodes 6 and 7) but it's taken up to now and Moffat to make this series really shine.