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UZR is a flawed statistic at certain positions which are very susceptible to park fctors.  LF, 1B, RF and to a lesser extent CF...Ibanez' high defensive rating in Philly vs. low defensive rating in Seattle has a simple root cause.  Well...two simple root causes, but we'll take them one at a time.
1) Safeco field has a HUGE left center field gap.  The problem with UZR is that it breaks the field into pie wedges based on angles between the foul lines and doesn't account for the increased area that some players must cover compared to others due to park dimensions.  By comparison, Citizen's Bank Park is TINY in left...we're talking about a difference of perhaps 500 square feet of area to cover.  That's a LOT.
2) Ibanez in Seattle wasn't really rated that poorly on defense except for 2007 - a year in which he spent the vast majority of his time playing injured.  Despite your objections on this matter, I still believe losing even half a step on defense can be the difference between being a good fielder and a poor one for certain types of players and that's what happened to Ibanez.  In Philly, when he got hurt, he went on the DL...in Seattle, he played through the pain because Hargrove was moronically attached to guys being "gamers".