The curious case of the Angels poor outfield defensive metrics

The Angels' outfield defense was supposed to be a many splendored thing. With Josh Hamilton supplanting Mark Trumbo in right field, Mike Trout shifting to left and Peter Bourjos returning to a starting role in center, the Halos had arguably the best defensive outfield in all of the land.
We even joked how the Halos could play just Trout and Bourjos and still have nary a ball drop in the outfield. Ha! Ha! Ha! LOLZ. /fart sounds
Intellectually, that all still makes sense. Mike Trout and, when healthy, Peter Bourjos have range on range on range. And that Josh Hamilton guy is no slouch either when playing in the corner rather than center where he just doesn't have the athleticism anymore. The problem is that our eyes thus far hath been deceived... or at least that is what the defensive metrics would have us believe. Just look at this table of how the Angels' preferred starting outfield grades out in the most popular advanced defensive metrics. SPOILER ALERT: Negative numbers are no bueno.
| NAME | UZR/150 | DRS | FRAA |
|---|---|---|---|
| Mike Trout | -2.9 | -5 | -0.3 |
| Peter Bourjos | -22.5 | -1 | -0.9 |
| Josh Hamilton | -0.4 | -4 | -1.1 |




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