I've always kind of enjoyed the Pythagorean Expectation number as a means to get a larger sense of what might be a reasonable expectation on wins. For instance, the Texas Rangers had a PE number that was around 82 wins, far below the 95 they ended up with, indicating a season of over-achievement. And in the post-season the over-achievement caught up to them. For football it's a number that's difficult to really get a sense on until around week 10, which we're past.
The PE formula is: (pointsScored ^ 2.37 / (pointsScored ^ 2.37 + pointsAgainst ^ 2.37

* 16
The Giants number comes out to 8.77, so about 9 wins expected as things current stand.
The Redskins number comes out to 8.56, so with the tie that would be pretty accurate if they only win 2 more games.
The Eagles number comes out to 9.64, so they are underachieving pretty hardcore at the moment and would need to win out to meet this expectation.
The Dallas number comes out to 11.5, so 1-2 more wins is a reasonable expectation based upon how they've done so far.
Weird statistical anomaly here as Giants, Eagles, and Cowboys have all allowed the same number of points against at 213.
Of course like most things of this nature you kind of have to take it with a grain of salt. Sometimes the play on the field belies the numbers, and in the end, like I said above, all you really need to do is make it to the playoffs. A good JG staple is that at the end of the day a team controls its own destiny. Sometimes a little luck helps though.