I'm honestly surprised they went with an older actor this time around. The previous two Doctors have been whippersnappers, with current Doctor Matt Smith the youngest to ever take over the part. The show's gained a lot of popularity the past few years from the tween crowd, who think both David Tennant and Matt Smith were "dreamy." I wonder how they'll react to a Doctor old enough to be their dad?
Capaldi is no stranger to Doctor Who, as he appeared as Caecilius in the 2008 episode The Fires Of Pompei (which oddly enough also starred Karen Gillan, who go on to play Amy Pond).
He also played John Frobisher in the third season of the Doctor Who spinoff Torchwood (the third season, Children Of Earth, being the best of the entire series IMO). This of course confirms my suspicion that there are only twenty five actors in all of England.
Capaldi also had a part in this summer's blockbuster World War Z. There's one of those wacky internet theories making the rounds about his WWZ part. In the film he plays a doctor at the World Health Organization (otherwise known as W.H.O.). His character is known simply as "W.H.O. Doctor." Get it? W.H.O. Doctor? Doctor Who? Ehh? Ehh? Plus in the movie the W.H.O. center is located in Cardiff, Wales, which is where Doctor Who is filmed. I'm sure it's all just a mildly amusing coincidence, but some are convinced it was all a series of elaborate clues as to the identity of the new Doctor.
He's been great in all the roles I've seen him play so far, so I'm sure he'll turn out fine. Every time there's a new Doctor I always think, "Why the hell'd they hire that guy?" but they always win me over after the first episode. As I've said before, if you don't like change, then Doctor Who is not the show for you.