Should we trust Adam Eaton's defensive metrics?

The right fielder has turned in stellar glove work this year. Has he really been worth what the numbers say?

As you may have heard, defensive metrics have looked very favorably upon Adam Eaton thus far this season. Perhaps you've seen some tweets about it. Maybe you've heard it on the TV and radio broadcasts. Maybe you're really into stats and have looked them up yourself. In any case, Eaton's defense has graded out superlatively well.

How well?

And....

So what does this all mean?