I personally didn't find the actual experience at Equestria itself terrifying at all. It was a little disturbing at first, but almost all of that was sheer physical disgust or a knee-jerk sour grapes reaction. But it seems to avoid almost all of the pitfalls of failed Utopias everywhere:
That said, there were moments of genuine horror, mainly stuff people have pointed out before:
I suspect your fridge logic would be solved by fvzcyl abg trggvat qb jung ur jnagrq, hagvy ur jvfurq ng fbzr cbvag gung ur jbhyq abg or n fbpvbcngu. I'm more worried about the part you rot13ed, and I suspect it's part of what makes Eliezer consider it horror. I feel that's the main horror part of the story.
There are also the issues of Celestia lying to Lavendar when clearly she wants the truth on some level, the worry about those who would have uploaded (or uploaded earlier) if they had a human option, and the lack of obviously-possible medical and other c...
So Eliezer said in his March 1st HPMOR progress report:
So I read that and it was certainly very much worth reading - thanks for the recommendation! Obviously, the following contains spoilers.
I'm confused about how the story is supposed to be "terrifying". I rarely find any fiction scary, but I suspect that this is about something else: I didn't think Failed Utopia #4-2 was "failed" either and in Three Worlds Collide, I thought the choice of the "Normal" ending made a lot more sense than choosing the "True" ending. The Optimalverse seems to me a fantastically fortunate universe, pretty much the best universe mammals could ever hope to end up in, and I honestly don't see how it is a horror novel, at all.
So, apparently there's something I'm not getting. Something that makes an individual's hard-to-define "free choice" more valuable than her much-easier-to-define happiness. Something like a paranoid schizophrenic's right not to be treated,
So I'd like the dumb version please. What's terrifying about the Optimalverse?