One number that I like to use when comparing teams' defense is defensive efficiency, which is basically 1-BABIP. This tells you how well a team turns balls into play into outs. Nats lead the majors in this at .724, the Braves are in the middle of the pack at .709. http://www.baseballprospectus.com/sortable/index.php?cid=1091208 This kind of takes out the debate over whether UZR or some other measure is accurate about individual players.
This stat seems arguably a better measure of the quality of a teams pitchers than its defense.
