I suppose one could look at SS + 2B UZR or DRS and put a number on the Nats infield vs. others. You could do wRAA or WAR if you wanted to compare offenses or some sort "wins" calculation.
Defensively, we are tied for 3d in 2d base UZR at 10.4, with the Twins. Ahead of us are Cubs (11.2) and the Mariners (13.4).
At SS, we are tied for 4th with the Os, at 9.1, behind the Pirates (16.3), the Mariners (14.6), and the Tigers (10.0).
Pirates have a 1.6 from 2d, Tigers have an 0.4. UZR does not like the Cubs SS (-2.1).
So, just by UZR, it'd be the Mariners (28.0), then the Nats (19.5), and the Pirates (17.9).
DRS does not like us as much. We are middle of the pack. mariners are still near the top.