It is a limited history, but so far Mark Wegner is the Dodgers most favorable umpire. It didn't result in a favorable game result, but there were quite a few calls around the strike-zone that went the Dodgers way, whether those were borderline strikes that were given to Dodger pitching, or ones that were called balls to Dodger hitters. In researching the data for this game, I came across a good example of why it should be 'taken with a grain of salt'. Not to undermine my own blog - I think there is definite value from looking at it and forming some sort of 'score' for an umpire's performance, and the data is probably 98% accurate, but look at the following:
Above is the pitch f/x graph for Descalso's AB against Paco to lead off the ninth inning. The red plot is indicating a "Called Strike" well below the strike-zone. I reviewed the AB and do not see it being anywhere near that indicated location.
It should also be noted that Descalso didn't even flinch at the call, indicating that he too thought it was a strike. You can see in the snap above that the pitch was mid-thigh, middle-out. I am not sure if this is a random 'glitch' in the recording of the data (like a radar gun sometimes missing), or what, but as I mentioned it stresses the fact that sometimes the data is not 100% accurate.