He's beloved by the gossip culture of Manhattan and was recently embraced by the left for hurling insults at CNBC "Mad Money" host Jim Cramer. But as Cramer's CNBC "Fast Money" colleagues explained, if you listened to NYU professor Nouriel Roubini, you would have missed out on a lot of stock market upside.

Roubini, often called Dr. Doom and known for crazy parties, predicted back in 2005 the speculative housing bubble would be the eventual undoing of the economy - and he was correct. However, as Jeff Macke, founder and president of Macke Asset Management and panelist on "Fast Money" explained May 11, being two years early with that prediction wasn't something to hang your hat on.

"Let me give you a little hint on trading," Macke said. "If you're two years early on any idea, what you are mostly is dead. You're a professor, as opposed to a trader. And if we still have time to talk after the five-minute butt kissing we gave the guy, I'll tell you what - he hasn't made anyone a cent. Until he does, as far as I'm concerned, it's a nice opinion but it's not making me money."

It's really frightening to imagine that people who get the bulk of their news from Comedy Central's "The Daily Show with Jon Stewart" will be making what they probably think are educated decisions at the ballot box come Election Day.

Stewart, who is now a self-proclaimed economist, said on his January 23 show, "Our economy is tanking." And now you can add financial media critic to Stewart's list of titles.

"For insight, I turned to the two major financial networks to find out what is going on, or as they're known around here, ‘hot ladies talk economy with bald dudes,'" Stewart said.