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I think Ibanez is somewhere in the -5 to -15 runs range year to year in LF. That makes him well below-average, but short of the Adam Dunn or Manny Ramirez type terribleness.
His UZR is doing something funky this year, but his RZR is poor and his Range Factor is terrible. We don't have the Bill James and PMR data yet but once we get it we should get a better idea.