Well, that was crap. I could dwell on
( spoilers ), or even the Doctor suddenly using "virus" and "bacteria" interchangeably because it's so in-character for him not to know the difference, but ... meh. This one found the strange intersection between dull and annoying.
ETA: Actually, that last item might be an artifact of Eleven's speech patterns rather than his truly using them interchangeably; I certainly don't care to watch again to check. But I left out
( another spoiler )! Why oh why do people write science fiction if they can't be bothered to follow through with the implications of the elements they introduce? It's like this whole season is a showcase for privilege-and-centrism fail. Bah.
ETA: Actually, that last item might be an artifact of Eleven's speech patterns rather than his truly using them interchangeably; I certainly don't care to watch again to check. But I left out