I'd imagine that one of the last things a pro athlete ever wants to hear is a coach, journalist or some random person say that they failed to live up to their abilities.
Most athletes are proud, work hard and sacrifice a ton to even make it to the pros, so when they finally get there and fall flat, it has to suck.
But it'd hurt a little bit more when that player just so happened to be hyped up early in his career as a superstar, but struggled to meet expectations and become average.
I'm not talking about draft busts like JaMarcus Russell or Kwame Brown, who failed so miserably that they proved to be even worse than just mediocre.
No, I'm referring to those who somehow have actually contributed to their teams in some way, even enjoying a long career—just not the one in which most people believed they would.