It was getting too "gotta save the Universe! Gotta save the human race! Gotta save the Earth!" for me. And Tenant's Doctor, though a good one, was getting very shouty. The last few episodes have been a case of high on production budget, low on story.
Mebbe he would do better to get all parochial again, smaller stories but with more punch. Like the excellent "Blink" episode.
And the new Doctor... as he said himself, at least he's not ginger -ducks-