I personally found "National Anthem" to be the most realistic and plausible episode so far - I mean, it's totally doable today, and I think the show gives an accurate portrayal of how such situation would develop with the modern Internet, and also of how helplessness even a most powerful person can feel when the whole system turns its back on them.
But each episode of Black Mirror is different anyways, so I'd give the rest a try anyway.
But each episode of Black Mirror is different anyways, so I'd give the rest a try anyway.