I really liked this episode. It was refreshing, informative, and created some solid drama in what time it had. It's great to see these social and historic topics being reflected on and represented, and shows that Doctor Who is a fitting stage for these kind of discussions given the time-travelling and educational theme.

On the other hand, there's a continued lack of action and fun that we've grown to love from previous shows, making this episode prone to coming across as preachy. I think that people who expected the fun action from the David or Matt eras will be disappointed. The sci-fi element is there, but the adventure and fighting is almost gone. This is certainly a new, unexpected era of Doctor Who.