While doing the write-up for the Clayton Richard trade yesterday, I pointed out how good his ERA was for Indianapolis, but also noted just how low his strikeout total was for the amount of innings he pitched. Most people see strikeouts as a sign of how dominant a pitcher is in the minors, and for the most part, it's a good indicator of future success, but it's not everything.
You can go back to 2009 in the Pirates' system and look at players that should be done with their minor league time by now, even if they were at the lower levels.