Bit of a curate's egg of a series, perhaps. Capaldi's take on the Doctor hasn't come across too badly, I think, but some of the plot lines were a bit awful. "The Moon is an egg" was a particularly poor example. And then there were several times when the tension was resolved just a little too easily, e.g in the season finale I thought they could have done something a bit better than actually happened. Also too many cheesy/ cringeworthy moments like, again in the season finale, where Danny Pink launched into that short heroic speech before nobly sacrificing his dead zombie self, or the hippy "trees save the world, man" thing.
But some good moments: the "monsters under the bed" episode was my particular favourite and stand-out episode, and Michelle Gomez made a good "Mistress" -- guessing that she wasn't killed so much as teleported somewhere, so we might (and hopefully will) see her again.