The Nats have been at or near the bottom of the league in strength of schedule since 2013.
And absolutely none of that matters.
2012 - Nats SOS was higher than the Giants.
2014 - Giants had the lowest SOS of all of baseball
2016 - Nats had a higher SOS than the Cubs
Strength of schedule is irrelevant
“World Series contenders” and “favorites to win it all” are different things.

Because basing your assessment on bookies is such a reliable metric