It is a very BIG company, and it is very easy to get lost in the maze. It is more "relationship" based than it should be given its size (people tend to gravitiate to what they know or what they have used in the past, regardless of how assets have evolved, or who might have a better set of skills to do a job). It is a large organization and there are a lot of experts that can be wired into projects, but the old partner mentality of building up a pyramid of known entities and promoting those people after x years of service is still there, after all it is an "up or out" model.
Lastly unless you "grew up" at Accenture, started from a fresh out of school analyst (or similar) it is difficult to break into a click or network. Bill Green may be a strong CEO, but the people 2-3 levels down might not be getting the total picture and aligning to Bill's direction.