This is the one problem I have with Clara. They all had a certain relationship with the Doctor that was touching and sweet in different ways, but Clara and the Doctor really didn't have that definite chemistry because he sees her as more of a mystery than a person.
That was my reaction as well. People are saying that Capaldi is going to be a jerk, I don't agree. I think the Doctor is on his way to the happiest time of his life! And also, people say Capaldi is too old?? Capaldi came out and said he's about 1350 years too young to play the Doctor.