I’m cautiously optimistic. I came around somewhat to Smith after watching some of his reruns as he could be very good when written well (which was unfortunately rare), but I think Capaldi can be much better than either him or Tennant. Loved Capaldi giving his enemy the choice between suicide and execution instead of reformation and execution. I’m hoping he’ll stay cold, but given how people have reacted in the past to the unfriendly Doctors (Hartnell and C Baker regularly place low in opinion polls, and Eccleston is easily the least popular of the new guys), I doubt this can last. Still, after two straight puppies in the Tardis it’s nice to see a grown-up again.