The first two episodes were great, the first one was probably one of my favorites in the series.
The third one was a great concept and had stellar acting by Aaron Paul playing two different characters in the same body, but also felt like it was missing something. I don't know if that was some sort of resolution at the end, but the non-Pinkman astronaut going straight to murder just ... didn't work for me. I know the episode was 80 minutes already, but it felt like a story that needed another 20-30 minutes to flesh out; the leap at the end was a lot. I felt like just killing off the replica to trap them in the same starship would have felt like more of a rational thought. I understand witnessing the murder of his entire family is going to cause him to snap, but it took a long time to get there and then he snapped basically immediately.
I enjoyed the twist in the fourth one a lot - given that this was Black Mirror, I expected a twist, but did not expect *that.* Something much more technologically oriented, of course. Also not sure why they felt the need to set it in the mid-2000's instead of modern day? To minimize the impact of cell phone cameras on paparazzi? Red herring? I dunno.
I'm OK with deviations on theme in general, so while the genre shift aspect of Demon 79 didn't bother me too much, I just didn't enjoy it as much as the rest. It felt like a story without a point to me, I guess. So she listened to her "inner demons," tried desperately but failed to complete their task and the world ended anyway? I'm not sure what the lesson is there. And I know not every story needs to have a lesson/moral, but it really felt like it was missing something. And I'm not sure what that was exactly. I did really like the lead actress and Paapa Essiedu (who apparently is not Donald Glover), but beyond that ... meh.