Capaldi was superb.Capaldi was more misses than hits, no doubt about that, but some of the hits (mostly in the latter half of his run) were absolutely stunning. I'll put "Hell Bent" and "Extremis" up against any episode in the show's entire history.
Hell Bent - is that the one where he doesn't say a word for the first 20 minutes, and yet completely dominates every scene he's in as the Time Lords come to negotiate with him outside that barn? That showed what a really good actor could do without even speaking.