Maybe I'm too out of touch with the culture to realize the meaning. But I think it's probably just shallow, and superficially appeals to people who don't usually think very deeply about related topics. Like Star Trek. A lot of people love that show, but from what I recall, it looked like a shallow soap opera for nerds. I think some people probably like Black Mirror more as a fashion accessory, because the idea of it fits their style better than some others.
But I will watch the new season, and maybe there's new writers and I'll find something interesting.