I have opened 7 exotic engrams in the last week and got 2 new exotics while the rest I already had. Now, if I had almost every exotic in the game I would understand my odds and go get another. The problem is I have barely a third of the exotic guns I can obtain and and only 4, yes four, pieces of exotic armor for my class and only 1 of them is good enough to be used most of the time on my load out. Fix you damn game!
Edit: In total I have opened about 15 excluding these I just opened in the last week
-
Honestly, Exotic engrams are complete worthless once you get all of the exotics. Given the fact that you'll use about a quarter of all exotic guns and like 3 exotic armor pieces, it doesn't matter.