That deal was damn generous on Trout's behalf. He essentially sold his FA years at 3/95. Trout is just so damn good that our traditional value capture metrics we don't even capture that he's a non-linear improvement over everyone else. I thought this chart did it best - a REGRESSED Trout (ie, to have the single worst season of his career) makes Andrew McCutchen look like chump change relatively.
2014 Positional Power Rankings: Center Field | FanGraphs Baseball