June 21 (stats continue to update)
Lest that my email inbox become further larded with your mash notes, I figured it would be didactic to explain the highly complex methodology used to assemble these rankings of the season's biggest disappointments.
First, relievers can't be disappointments, because every late-inning guy not named Mariano Rivera eventually melts down just enough to befoul his stats and rep. Second, injury cases can't be considered disappointing, unless the victim in question injured himself doing something colossally stupid, like banister-surfing. While it might be disappointing on a baseball's-better-when-the-good-players-are-playing level that we haven't seen much of Joe Mauer and David Wright and Ryan Zimmerman this season, mostly it's unfortunate.
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Finally, disappointment is relative. Chris Johnson might be a disappointment to a subset of Astros fans charmed by his unlikely second half of 2010, but not to anyone who followed his path before the supposed breakout. Similarly, if Tyler Colvin were having the season Nelson Cruz is (.507 slugging percentage, 111 OPS+), his teammates would break into song. But Cruz has raised the bar to the point where his willful disdain for the strike zone (a .288 on-base percentage) is unacceptable and, yes, disappointing.
Maybe disappointment is in the eye of the beholder -- which is to say, you and me and whoever else is weighing in on the subject. But we can all agree that Dan Uggla sucks, right?