(Warning: Spoilers)
I'm real happy to be watching Doctor Who again but I didn't enjoy the first two episodes much. The only parts I liked in Deep Breath were the ones with Madam Vastra, Jenny, Strax and the T Rex. The Doctor was still a non-entity for me and I didn't bother to focus on him because at this point, he was still getting used to his regeneration and trying to figure out how to talk and act. It's good how they showed Clara's discomfort in dealing with this stranger though; she was definitely playing stand-in for the fans who miss Matt Smith and are getting used to their hero in an older body :D
Clara and Twelve will do fine. In fact, I wasn't happy with her girl crush on Eleven because not only did he already have River but the situation had a 'been there done that' stamped all over it. Didn't that one sided attraction happen with Martha before? Anyway, Clara's caring personality makes a good contrast with Twelve's grumpiness. She's a teacher who learns a lot from him and he learns a lot from her, too.
