I would expect the following things to have failed:

• Good community norms (this is a difficult problem that LW has solved admirably)
• Using advice from LW to improve my social skills (this is actually sort of a subpoint of "if someone else does it better, LW points you to them")
• Promotion of thinking about pet issues (this one failed by less than the others--the sequences pretty much cleaned out the god-hating but I'm constantly annoyed at people who don't have good epistemology)

there's plenty more that is substantially less tangible, and YMMV, but those first two points have created a large amount of value for me personally.