Judging from Neverwhere and Children of Earth, I'm sure Capaldi will do superbly in the role.
It's also worth pointing out, since a number of people elsewhere have been complaining about it, that having an actor who plays a Time Lord having appeared in the series previously is not unprecedented; Lalla Ward played Princess Astra before Romana regenerated using her appearance, and Colin Baker appeared in one of Peter Davison's serials.
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