Abp. Williams was a weirdoid. The CofE has some better primates, including Bishop N.T. Wright, and that Bishop of Durham from Nigeria or wherever it was. The CofE, surprisingly!, has some great people.
I have the impression that Williams was the standard sort of left-wing flake that the English-speaking world has been putting in positions of power for the last thirty years or so, on the theory that having established cultural foundations is boring, and that the condition of strength and stability unfairly deprives up-and-coming writers of drama that can be turned to advantage as they climb their career ladders.