I appreciate the effort that's been put into constructing WAR but the thing it wants to quantify - the defensive side of the ball - is just too touchy-feely for me. I keep hearing about having "trained observers" acting like robots to rank every defensive play a defender makes the same way and I don't buy it. I've had some experience with "standardized testing" as it relates to testing methods and I'm sure that these observers still are unconsciously putting their own bent into their rankings.
IMO dWAR is even more nebulous when it comes to ranking outfielders defensively. Would Betts Range Factor be as high as it is if he were playing LF where there's a lot less field to cover? Would Beni's Range Factor be higher if he were playing Right Field, for the same reason? And yet Range Factor is one of the biggest factors in dWAR.
As I said, I appreciate the effort that goes into it but I don't think it's the be-all, end-all by itself when we come to ranking players, nor do I think it should be the stat that ends an argument like it often is here. It should be taken along with observing the player. Sometimes I trust my own lyin' eyes more than I trust someone else's numbers.