Watched it last night .. hm, still not entirely convinced by David Tennant. Not sure what it is about him that bothers me, just a little. But then, the clip was short, and at least for me the audio turned pretty difficult to follow for the later part of the mini-episode.
*is waiting for the Christmas episode impatiently anyway*
I very much want to like Tennant's doctor, but unlike some others, he just hasn't grabbed me from the very first moment. Doesn't mean he won't grow on me of course. (With Eccleston, I knew and liked the actor before he became the Doctor, so that made it much easier to immediately accept him; I haven't seen Tennant in anything else at all, which probably doesn't help.)