Being older and pretty set in my ways, as well as being not very well versed at all in advanced metrics, I look at OPS, BA, RBI, HR in that order for batting, with SB and base running thrown into the mix for offense. For defense, it's mostly the eye test and position played as I really have a hard time understanding the defensive metrics and am not really convinced as to their accuracy/value. Mostly, as reillymcshane alluded to earlier, I ask myself what player I would take if I could have any player in the given league, assuming that every player in that league would always put up the exact same numbers. Edit: As I said earlier, 52 and Trout without a doubt.