I follow Andreessen and a few of the other a16z folks on twitter, and every day they are tweetstorming what appear to be very insightful opinions and predictions on a whole slew of industries. And then I wonder if these guys are actually orders of magnitudes more intelligent than me and others, and have truly valid and well thought-out opinions, or if a good amount of what they say is nothing more than speculative bullshit that's hardly contested due to their reputation and success.
I've got enormous respect for them, too, but I'm beginning to think that the breadth and depth of expertise and foresight they display shouldn't be taken too seriously.