My opinion of him plunged and never recovered after seeing him present at a YC demo day some years ago. He threw up this slide of a heroically ascending curve and proclaimed 'This is what exponential growth looks like!' to huge applause from the packed house, while I wondered why there were no numbers on the Y axis. OK, that wasn't the only thing that bothered me, but if someone insults my intelligence then I see no reason to put any trust in them.