This is a mega-hidden gem that should be watched by anyone who appreciates good TV.
A well researched mini-series, Black Mirror uses the current technological context of our world to show us the side of ourselves that we often tend to ignore. There's no sensationalism, no arbitrary shounen-like valor that permeates typical television. This mini-series makes typical Western TV look like gaudy and superficial, like those typical Japanese gameshows.
The fact that that TV is the medium used to express this... humanity brings a profundity to this series that I simply haven't seen in any other TV show.