Victor Martinez played a good chunk of his career as a Designated Hitter, which, as you may deduce, means that he was not a good defensive player.  Saying that this does he mean he was pretty solid with his bat.

Santiago Casilla played his entire career in the Bay Area, and in the 655 Games he appeared in, he never started one of them.

The career of Ryan Madson began with the Philadelphia Phillies, where he struggled to find his role.  He would later find his baseball purpose in late relief, and he would help them win the 2008 World Series.  In 2011, he was Philadelphia's closer with 32 Saves, but that would be his final year with the team.

As Phil Hughes worked his way up the New York Yankees system, the hype machine that surrounded him seemed to grow annually.  He did not live up to it, and his career was riddled with inconsistencies, though that did not mean that Hughes did not exhibit flashes of brilliance.