Major league baseball players have voted Angel Hernandez as one of the most incompetent umpires in the game. His continued employment is clear evidence that MLB does not care about putting the best umpires on the field.
Hernandez was behind the plate for Friday's Twins/Red Sox game and his calls on many of Tim Wakefield's pitches were shockingly bad, even by the low standards fans now expect from most umps. Here is a graph of Hernandez's calls on all of Wakefield's pitches.
Justin Morneau, 1st inning
Called strike, ball, ball, ball, ball:
Michael Cuddyer, 2nd inning
Ball, ball, ball, called strike, called strike:
Denard Span, 4th inning
Called strike, ball, ball, swinging strike, ball, L8:
Here is the graph for Scott Baker's pitches, with far fewer bad calls (two of those led to Dustin Pedroia's walk in the first inning):