This is no different than Sanchez always plays. If his team has a solid lead and the defense is playing well, Sanchez can manage the game and hit a few big plays to bring home the win. If the game is put all on Sanchez and he has to play from behind, he is not going to win you the game.
Sounds a lot like Romo actually.
A bit unfair to judge Sanchez after this game. At Green Bay, down 17-0 before you know it. He didn't really cost the Eagles until they were already out of it.
Eagles offense is predicated on first downs, without those, team struggles.