Regarding John Mayer in general, I say give the kid a break. He's young, famous, handsome and rich. He'll probably get over himself someday. He isn't that much different than say, Frank Sinatra at that age. Pretty tame compared to Jim Morrison. Young Johnny Cash? Hank Williams or Lefty Frizzell? The early years of say, Miles Davis or John Coltrane? Is he as talented as any of those? A lot of great musicians come on the scene as one trick ponies, and evolve from that. John has already shown more than one trick, so who knows where it will take him.
As a blues player, I agree with Walter, he is pretty ordinary. But he is exposing a new generation to music they probably wouldn't hear otherwise.
People who expect musicians to be great role models are bound to be disappointed.
All in all, it's just another brick in the wall. :wink: