Was thinking about Black Mirror, and how I'd rank the episodes so far...
Definitely think
Arkangel was much better than people gave it credit for, although it was let down by the weak ending. It didn't make sense that she didn't go looking for her boyfriend, and instead went hitch-hiking
The Mother was so overbearing that it drove me nuts, and I think that worked great for the point of the story (how far a parent will go to protect their child, even if it means invading their privacy beyond what's acceptable).
Shut Up and Dance shocked me so much, that twist... I'd say the best episode of the ones I've seen. I was in suspense throughout the whole car ride.