I know I don't have alot of time in (comparatively to most people on this board ~160 hours between three characters), but I have NOT gotten an exotic drop or one from a legendary engram from ANY activities (granted I haven't completed a raid yet). ALL of the exotics I have were bought from Xur. But it's still frustrating when I get shards or strange coins from Nightfalls while my fireteam members get Exotics all the time. RNG is NOT my friend.