I think the last 2(?) seasons lost the essence of what made Black Mirror great but the older ones are excellent. Older episodes often felt directly applicable to the evils of technology we use today but these newer ones seem to be more generic Sci-Fi, season 6 didn't feel like Black Mirror at all to me.

Common People is utterly terrifying. Woman falls into a coma, so startup uploads her mind to the cloud so it can stream her mind back to her. Then they start to enshittify the poor woman's life. Can't even sleep because they're using her brain as a CPU. She gets mercy killed while blurting out ads for antidepressants to the person doing it.

Metalhead is also among my favorites. Those kill bots put Skynet to shame.