What troubles me a bit in all this discussion is the implication that Moniak, as a player, is somehow a disappointment - that he's not performing as he "should be" performing.
I can understand it if one argues that a 1:1 should be developing more rapidly - and that Moniak's actual development suggests he wasn't a true 1:1, or that the Phillies erred in drafting him 1:1. I cannot understand being disappointed in Moniak; he didn't make the draft pick. Austinfan is correct, IMHO, to characterize the pick, at this point, as a sunk cost; what matters now is what Moniak can become - not what somebody else chosen at that point "might have been."
It comes down to "whose fault is it?" when a draftee doesn't perform the way some scouts thought he would. Is it the player's fault, for not "doing enough" (whatever that might mean)? Is it the scout's fault, for poor prospect evaluation? Is there an element of chance (luck), that we probably don't want to acknowledge?
At this point, when I see somebody lamenting that Moniak (or anybody) is a "disappointment," because they're not performing the way they "should be," based on draft position or whatever, my reaction is pretty much, "Get over it. The only relevant question is whether the player has value, whether the player can contribute."
Bobby Abreu. Yes, he didn't run into walls. He didn't make acrobatic dives for balls he probably couldn't reach anyway. He was what he was.... and what he was, was arguably the best right fielder in the history of the franchise - if only fans could see beyond their "expectations."
That doesn't mean one shouldn't question the club's draft strategy, if they consistently "miss" on high picks...but I would caution about drawing a trend line through one or two data points.