He might be okay writing stuff (Duval), although I wouldn't know, but boy, is he ever heavy going on screen. Perhaps he falls into the 'well respected' league and therefore gets hauled out for big occasions (like granny's best tea-set), but he comes over as dull, trite, and utterly humourless. There are hundreds of knowledgeable people - why, most of this forum, for a start! - who can sound interesting and breezy, crack the odd funny now and then, and who'd wrap half these 'experts' up in a three-card trick.