I think it's pretty accurate. Look at Colabello, the eye test says his offense is barely making up for his defense... WAR agrees with that statement. But defensive stats, they say, are not reliable over short term so who knows.
Hamilton has stolen 23 of 27 bags... that in itself is a lot of value, not to mention range in the OF, going from 1st to 3rd, 2nd to home on singles, etc.