I'd be interested in seeing a list of consultants' greatest wins. I mean the projects proposed by consultants that enhanced company values by the most. There's plenty of stories of consultant-driven disasters ... but I wonder how many of those are just the rank and file grousing about over-paid outsiders.
But if there's anything worse than consultancies, its bureaucracies. I have a lot of experience dealing with bureaucracies in health care and aviation. And my god, bureaucrats can be some of the worst of human capital. Nowhere else can you get such a marriage of apathy, laziness, and unchecked power as you see in bureaucracies. At least in the private sector one has to be an avaricious asshole and possess a type of animal cunning at the very least to climb to the very top of the power hierarchy. In bureaucracies you might find a guy with absolute power over regulatory decisions and he has the motivation and intellectual capacity of a well-fed water buffalo. How did he get there? He just stuck around longer than everyone else.