Huh. That's not what I see at all. I see a list where there are 2 all stars. Some solid players, and a few guys that never made it. If you count Hermida as a success story for a top prospect, then that to me is a pretty low bar. Alex Gordon is terrible. He can't crack KC's lineup. He, by the way, was 'can't miss' once upon a time.
There are teams out there that are terrible year after year because they trade established stars for prospects in the hope that some of those prospects can eventually become stars themselves. What I see from that list is that, even among top prospects, only a handful reach that level.
I'm pretty sure if KC ends up with 3 more Alex Gordons and Jeremy Hermidas and Quentins, they'll be disappointed.
You don't see Quentin's bat, as far as rate stats, being just a notch below Zim? Really? The list was best "hitting" prospects.
You've got Delmon Young, still only 25, who has a .760 OPS which was a good .826 last season after three mediocre years at 22-24 (wOBA jumped to .352).
You've got Stephen Drew who put up the 3rd best OPS and wOBA at SS last year at age 27 (behind only Tulo and Hanley).
You've got Howie Kendrick who was 10th in OPS and 12th in wOBA in by far his worst year at 2B.
You've got Quentin who was 10th in OPS and wOBA in RF last year and was 2nd in OPS and 3rd in wOBA in LF in 2008.
That's a lot more than just two all stars and some solid players. That's at least 3 elite bats (Zim, Fielder, Quentin--who can't field at all) and two top 10 bats at their positions in the MI. 5 for 10 seems a little more accurate for who has been a successful "hitter" at the MLB level.
You've got Gordon who put up a good offensive 2008 then got hurt and hasn't play that well since then. Hermida had a very good offensive 2007 and even his 08/09 seasons were a little below average batting.
In a list of hitting ability, they've done pretty well.