I disagree with this comment.Anyone who thinks they can intelligently and originally discuss what's going on in 3 or 4 sports is just a bulls*** artist. Or they are regurgitating someone's opinion.
It applies to some, but not to all.
I feel VERY comfortbale that I can cohertently discuss the NFL, MLB, NBA, college football, and college basketball. I know zilch about the NHL.
I think Mike Greenberg is a "talking head" who is well versed in all the major sports-- Mike Wilbon as well.