1. Braves 28-18 0 Games Behind
2. Nationals 25-23 4 Games Behind
3. Phillies 23-25 6 Games Behind
4. Mets 17-27 10 Games Behind
5. Marlins 13-35 16 Games Behind
Obviously, since it's only late May, the Braves, Nationals, and Phillies obviously have a chance to win the division. Also, if the Mets got hot, they could make a push through June and July. But, the Marlins are not contenders in the division or for a playoff spot.
The Braves and Nationals will still be the favorites to win the NL East, but you cannot count out the Phillies or Mets. If the Phillies gain some consistency, they could easily have a chance to win the division. If the Mets get hot, it could be them, but they need a lot to overcome the three teams ahead of them.
The division at this point is still interesting, and it hopefully will stay this way throughout the rest of the year. This may be the division that gets decided in September.
But, right now? The teams have to keep playing well.