It's not just Annan. There's enough corruption in the UN on every level and in every program to prevent it from ever being areal force for good in the world. (Check out here and here, for more comments about this) It seems that the UN has become the cover used by thugs and tyrants all around the world.
Cartoon from Cox and Forkum, of course!
UPDATE: Roger Simon has more on Kofi and the UN and their passive aggressive behavior toward freedom and democracy.