Don't know if anyone else has noticed, but the exotic engram drop rate had to have been nerfed in the last patch. Before the last patch, I was getting at least 2 during call of arms crucial play, per character and at least one every 4-5 heroic publics, per character. Even using fireteam medallions, I have had just 2 drop (over all 3 characters) since the last patch, including Caydes treasure maps. Also, the engrams are only rolling to the same light level or below. The rewards are bad enough in this game, added to the light level lock on the engrams.