It didn't feel like Black Mirror which even if they never stated it was about dark twists of futuristic technology. It was even placed in the past!
I get the message of "we have to be careful with online addictions" but that's not original and it's rather predictable. We're in 2019! we hear and read articles about this topic all day. The show is going a different direction now and I honestly fell asleep during the whole episode.
Review of Smithereens
