I'm pretty dubious of WAR, because I believe that it overrates some positions by subjectively assigning them a value. Most specifically, center field. Though it may be more difficult to play center at a high level, I don't really think that it's that difficult to play adequately. More specifically, if you are bad in center, you are likely to be bad in the corner positions as well. On the other hand, if you are solid at the corner positions, you should be decent in center. Why should a guy be penalized if he is blocked and forced to play corner outfield because the team has an established CF? It seems to me that almost every guy that appears vastly overrated by WAR is a centerfielder (Mike Cameron, I'm looking at you) who puts up decent offensive stats relative to his CF 'peers'. Going further, shortstop is more difficult to play than center, but is it really that much more difficult than third?