I think it's worth pointing out the difference between "it didn't work" and "it could never work" though, the latter of which seems more like what people mean with BS jobs.

I know a fair number of people in consulting who have seen how the sausage is made, and they don't see how it's useful in any normal way. It's useful for certain parties in a firm, but it's not useful in a general sense of delivering what it says on the tin.