I used to be very skeptical of Eliezer's ideas about improving rationality when he was posting the Sequences, but one result that's hard to deny is that all of a sudden there is a community of people who I can discuss my decision theory ideas with, whereas before that I seemingly couldn't get them across to anyone except maybe one or two people, even though I had my own highly active mailing list.
I'd say that being able to achieve this kind of subtle collective improvement in philosophical ability is already quite impressive, even if the effect is not very dramatic in any given individual. (Of course ultimately the improvement has to be graded against what's needed to solve FAI and not against my expectations, and it seems to still fall far short of that.)
It's indeed nice to have a community that discusses decision-theoretic ideas, but a simpler explanation is that Eliezer's writings attracted many smart folks and also happened to make these ideas salient, not that Eliezer's writings improved people's philosophical ability.
Previously: round 1, round 2, round 3
From the original thread:
Ask away!