As flawed as any metric may be, they are still far superior to the eye test. Last year there were 43,489 innings of CF played, how many did you personally observe? When Lagares was a regular CF from 2013-15 before injuries hit he registered a +54 DRS (1st), +25.7 UZR (2nd) & +13.4 UZR/150 (1st) in 2,673 innings (12th). From his debut in 2013 until now he is 3rd in DRS (+92), 5th in UZR (+38.2) & 3rd in UZR/150 (+14.3) over that time frame despite being only 19th in innings (3,784). Since you brought up Cain, since 2013 he ranks 2nd in DRS (+82), 4th in UZR (+45.4) & 7th in UZR/150 (+10.5) in 5,727 innings (5th).