Watched this year's Black Mirror, season 4, and liked those episodes a lot. Far more than the previous years, not that I did not like the previous episodes, just that I did not like them nearly as much as S-4's episodes.
Also watched Arrival and I am not sure if I liked it or not. Still a little confused by the movie but I <think> it was good. The problem is that they did not tie everything up in a nice, neat and finished bundle and I grew up in the 60's and 70's where all problems are presented, discussed and dealt with, and all things are perfect by the end of each episode, and almost all full length movies. Arrival absolutely has an ending, it is just that that ending is not a perfectly clear- cut thing and sort of leaves the viewer with questions.
Brian