With the rainout on Friday, the Braves made the decision - which is theirs due to being the home team - to play a doubleheader the following day rather than make the game up later in the year. The Mets play the Braves in Atlanta two more times this season.
The problem New York has with the decision is the fact that they are coming off a doubleheader against the Rockies on Thursday. Their pitching staff is already in a mess with injuries, and the bullpen has recorded a major-league-high 47 innings to this point. So it seems like it would make sense for the Braves to take advantage of this by hitting them when their staff is in a hundred different directions, and they are forced to start a relief pitcher in one of the games.
At the same time, the Mets may find this to be to their advantage, as well, due to the fact that the Braves are not playing well right now. I am no future-seeing man with a crystal ball, but I have a feeling Atlanta will eventually play better than they are right now.
Also, while the Mets staff may be taxed at the moment, thinking it will be any better later in the season is not smart. Arms wear down over the course of a season. Putting off extra innings for the bullpen until late in the year only makes things worse.
In case you're wondering, the other two home series with the Mets are mid-June and mid-September.