Lately I've always seen the NFC East as an X factor division... because since Redskins owner gave up GM duties and since Andy Reid left, you honestly don't know what you're going get from the division except 1) inconsistency and 2) over-hype for all four teams at the start of the season.
But there are reason all four could improve on last year
New York Giants ~ they choked away a number of games that they should of won. If they stop choking they could get a lot more wins.
Dallas Cowboys ~ last year they lost two of their most important players, starting RB (FA) and starting QB (injury). Getting a new star RB in the draft and if they can keep Romo healthy, they could potentially control the clock behind that very good OL and keep their defense off the field.
Washington Redskins ~ If I remember correctly, they had a lot of injuries at OLB, CB and S. They had Lots of injuries for the Redskins last year with Will Blackmon, Dashon Goldson and a 6th round rookie starting at DB in the playoff game. So if they stay healthy, they could be a lot better... though their starting RB might of just gotten injured. And they might have the best OL coach in the entire NFL with Bill Callahan (who was the Cowboys OL coach not long ago).
Philadelphia Eagles ~ They seemed to have a fairly talented group of players, but Chip Kelly's boom or bust super fast pace offense seemed to keep leading to the defense being on the field way too long and wearing down and losing their star offensive players one way or another... now with Doug Peterson as head coach.
But based on history of the NFC East at least one of these teams will explode some how, another will be extremely inconsistent, one will play pretty well and other one will be switching between the first three things (playing well, inconsistent and exploding). Switch is switch, is probably anyone's guess at this point.