Do top Astros prospects flame out more often than other organizations?

I was watching Jordan Lyles pitch in the futures game and wondered how many Astros prospects in the futures game actually become successful. Looking back a few years the results don't look good.

2010 - Lyles: dominating AA at age 19, hopefully he lives up to his top 30 prospect status.

2009 - Jason Castro: Made the majors his 2nd full year out of college but is currently hitting below the Mendoza line. Projects to be a solid everyday catcher with above-average defense and average hitting.
- Chia Jen Lo: Puts up good numbers every year but is currently injured. Projects as a setup man.

2008 - Polin Trinidad: A few good seasons in the low minors got him into the game but recently has put up back to back seasons of a 4+ era at Round Rock. Unlikely to project to more than back of the rotation fodder.

2007 - JR Towles: Had that magical September a few years ago but was handed the starting C job several times and never made anything of it. Still relatively young but looks like a total bust.
- Jimmy Van Ostrand: His OPS is down .220 while repeating AA this year. At 25, his prospect status is (like others) in doubt.

2006 - Hunter Pence: The one no-question success. Several solid seasons and made the All-star team last year. Down season this year but he's a solid player who could be in Rt field for a long time.
- Jason Hirsch: Once the Astros top pitching prospect after winning Texas league and PCL pitcher of the year in consecutive seasons, Hirsch was traded with others for Jason Jennings. Was a bust in CO and is currently in the Yankees system.

2005 - Troy Patton: one of the few times Drayton actually signed a player above slot. Made the majors with the Astros in '07, was traded for Tejada, and hasn't seen the majors since.
- Fernando Nieve: cut by the Astros last year and had some solid starts for the Mets last season. Currently has a 5+ era for the Mets this season.

2004 - Willy Taveras: had a few decent high SB, good defense seasons but finally caught up to the fact that you can't steal 1st base. Pretty much a journeyman now playing for the Braves.
- Chris Burke: I'll always like him for the 18th inning shot that year but never amounted to anything else.

In summary: 7 years of Astros prospects playing in the Futures game, 12 total players, only 1 solid everyday player (Hunter), only 1 other player is up with the big club (Castro), only 1 can still be considered a top prospect (Lyles), and most are fringe major leaguers or are total busts.

Now my question is: is this normal? Do most teams top prospects bust out this frequently? That's 12 top Astros prospects with only one solid player. Hunter isn't even a star player, he's just solid.

 

I agree that many, if not most, teams have lots of "prospects" that amount to nothing. But the list I mentioned was basically 1/12 success rate. I highly doubt for the supposed top organizational prospects any team is worse than the Astros.

The number of prospects the Astros have had that came out of no where to have successful careers (e.g. Wandy/Zobrist) is probably closer to the norm. But on the whole, we're not even developing semi-useful players anymore (backup outfielders/platoon players/#5 starters/middle relievers)