On paper, "The Girl Who Waited" was brilliant. Karen Gillan? A revelation. So why did I take a 45-minute walk around the neighborhood, grinding my teeth, trying to figure out how I felt about the episode?
Thanks to Huw at thirteenfaces.com for linking me to Emily Asher-Perrin's essay at tor.com on the relationship of the Doctor, and Doctor Who, to children. It was the whack on the side of the head that helped me understand my reaction.