But seriously, putting the clever people in charge can't be a bad thing. Problems might take a while to resolve, but can they possibly be worse than politicians?
Same goes for Sophocracy.
Edit: And Meritocracy. I always liked Terry Pratchett's idea of getting a businessman to run the economy. Or a crook.
Dictatorship. If you found a leader that is not corrupt, has no mad ethics, etc., it would the best one. Not sure, if there are any of those humans, though.