It was mostly Rares, but for me last night, I noticed that, too. Between the Daily Heroic and just a few patrols to knock off a couple of bounties, I ended up with eleven Rares and a Legendary. Twice, I hit the "jackpot" chests on Mars. One with two Rares, and one with a Rare and Legendary. Got jack and shit worth mentioning from them, though. So, the Crytarch still is a bastard. :-)