Seasons 1-4 were brilliant. All unique themes woven into creative stories that unraveled at just the right pace.

Season 5, not so much. It had nothing to do with the noticeably more mainstream actors; they didn't have much to work with. The writers seemed to rehash technology themes, but didn't work up the sickening sense of dread that we've come to expect of Black Mirror.

Without it, the season feels forced and preachy. Ultimately, I was bored with Season 5. Good thing each episode is standalone, otherwise the entire series would be ruined.

ETA June 2023: After finishing the first episode of Season 6, I was super excited because I thought it was Black Mirror returned to form. Unfortunately, the rest of the season is lackluster; the actors turn in great performances, but the storylines were weak and, as another reviewer described it, bloated. It's not as a bad as S5, so my rating doesn't change. Still totally worthwhile.