I addition to the points made about WAR and its purpose generally, there is also the corrolary to filihok's points: People who rate players don't rate catchers as high as they rate players at other positions. How many catchers in your top ten? top twenty? Where do you have Berra or Bench ranked?
Bill James has Joe dimaggio ranked 5th among center fielders. Who's your number 5 catcher? His number 30 first baseman, is Gil Hodges. His number 27 catcher is John Roseboro. Two of my favorite players as a kid and now. I think Gil is overrated, but not by James, and Roseboro is tremendously underrated, again, but not by James. But c'mon.
Indeed the first step toward finding out is to acknowledge you do not satisfactorily know already; so that no blight can so surely arrest all intellectual growth as the blight of cocksureness.--CS Peirce