The really funny part of HPMOR is that, while it was intended to demonstrate rationalism, what I got out of it was that rationalism doesn't actually work.

I'm unwilling to post spoilers, which makes this unfairly undiscussable, but the meaning of the original prophecy did not--could not--come down to rationalism and could not for reasons that were repeated a few times through the fic. I can't tell if this was intentional on Yudkowsky's part, and I don't really care, since it really changes nothing about everything else.

For the record, though, when I disparage utilitarianism, I promise it isn't just "Eliezer's".