From the outset this question isn't as straightforward as it first appears.
At the time of writing we're halfway through Peter Capaldi's first season and we are still learning about his new personality and seeking an answer to the question, 'Do we like this new Doctor?'
Physically, the new Doctor is older looking, this was a deliberate move by show runner Steven Moffat to end the Doctor/Companion love interest/attraction angle. We know that on some level Clara was attracted to the Matt Smith Doctor and even had him pretend to be her boyfriend for the Christmas Special. The change in appearance also allowed for the development of the Clara/Danny relationship. (The amount of emphasis this relationship is being given is upsetting a lot of fans.).
Peter Capaldi has stated that his Doctor isn't going to be so "user friendly". Fans have already seen the new Doctor's lack of social skills. He is constantly insulting Clara and has shown himself to be brusque and irritable with those around him but whether this makes Capaldi's Doctor unlikeable or just quirky remains to be seen.
The Doctor's core qualities, his desire to help and get involved, his sense of justice and his unswerving curiosity, are still there but as we've seen, the strength of these personality traits ebb and flow according to the regeneration.
With the rest of Season Eight to go and the Christmas special to end the year, the jury is still out on Doctor number twelve. Will He mellow? Will he become even more irritable or could he undergo yet another regeneration? When it comes to questions regarding the Doctor, only time will tell.
