The issue I'm having with rare engrams has been growing on me ever since I started thinking about it about 2 weeks ago. Since the engrams were patched so that they only provide engrams of there rating and up (So you can no longer get an uncommon from a rare or rare from a legendary), I cannot recall a single time that I have ever received anything but rares from rare engrams (And rare engrams are identical in value to common and uncommon, since I dismantle them immediately regardless). Which brings me to ask the question of whether or not my account is bugged, as I appear to be the only one having the issue. I'm a pretty active user and have been through at least 100 rare engrams alone this week, and I'm sure you'd be able to run through the destiny server/player logs to verify this.