Yea it does. It’s wins above replacement. Robles is 1 win this year. Stevenson is basically a replacement player.
If you believe in the abstract WAR model, if the sum total WAR for a team for an entire season is zero, the team wins 54 games. Essentially the number of team wins should equal 54 plus total WAR (The number, 54, varies from year to year and is set by the WAR lords.) Nats are on pace to win 53.6 games, so their total WAR would be negative. Robles has 1 WAR, so that's something.
Again, that's if you believe in the abstract WAR model. I don't.
Most of all, I don't understand why Robles is batting leadoff. The most fundamental rule of batting order is to leadoff with a guy who gets on base. You want an OBP of at least .350. Batting a guy leadoff with an OBP less than .300 is unforgivable. It just illustrates how little baseball intelligence Dave Martinez has.