Which Dystopias Are Too Realistic to be Enjoyable?

Everybody likes to watch civilization crushed by flaming alien weapons from space, or eaten from the inside out by zombies. But sometimes a dystopia goes too far, getting so bleakly realistic that you can no longer enjoy the carnage. What dystopian stories were like that for you?

Tell us your answers in comments below — you can choose anything from a game or comic, to a movie or book. Pictures, links and video always appreciated!