Hat tip to Jason Collette (obligatory FanBall mention) for alerting me that Minor League Splits now has limited minor league defensive data. It's based on the Total Zone system, but I glanced over a few Rays pages and here are the results. Take them with a grain of salt.
Averages since 2005/6:
CF Fernando Perez 11 runs
SS Reid Brignac 8.25 runs
CF Desmond Jennings 6 runs
Neither of those three seem outlandish. If Brignac really in the 5 < x > 10 defensive range I think his stock raises. Also: Durham is killing Perez' average.