He is not the person you would want to make the decision, but he is a person you'd want in the room when the options are being explored.
He has insights and ideas that are missed by many advisors and yet sometimes has gaps on the problems that attend execution or the political intangibles that can affect public opinion. He is a brilliant fellow who does not suffer fools gladly although he often pretends to do so. Over the years, his wit has produced an impressive cadre of enemies, most of whom are not in his league when it comes to creativity and analysis.
He can be charming, irritating, and so smart it is scary.
When discussing major decisions, ignore the grumbling of others and make sure that he is in the room.