I feel your pain, I hit the grind hard last night, killed over 800+ on Venus, got around 30-40 uncommons, 10 or 12 rares and ONE legendary chest engram. I go back to the tower and start turning everything in, I get to the chest piece and decrypt it, much to my surprise it was purple! I'm like OMG! YAY! then I look in my inventory and it's for a -blam!-ing Warlock! I swear he certainly knows how to piss me off!