He was oversold in the 70s. You couldn't move for stories about him.
Professional "geniuses" need the quotes. Pinker, Kurzweil.. all of them are much-in-little.
(He was, unquestionably, bloody smart. Far smarter than the average Joe, far far smarter than me. He wasted his talents. Consider Robert McNamara. Don't agree with a lot he did, (Vietnam!) but I suspect he was a similar calibre to De Bono)