I thought that Capaldi was officially an awesome Doctor with the opening Series 9 Two Parter The Magician's Apprentice/The Witch's Familiar. I thought he was a good Doctor from the few good Series 8 episodes, but for me he really clicked in those two. I wish he was a bit more gruff like he was in Season 8, and his obsession with Clara was irritaiting, but in general I'd say he established himself well in Series 9. Now, he just needs a good companion, and more consistent scripts. Hopefully Series 10 will give us that, and I'm also hoping we'll see him in Series 11, too.