Yeah the drop rate seems to be heavily flawed, I've put in 40 hours into the game so far recieved a few blues, and I think four purples, with only one turning out to be a purple, and even that was a rocket launcher, (my least used weapon). I think Bungie has specially designed the game to screw with your head, I got this Rare Ghost Mission from the Bounty boards a few days ago, and after finding the Ghost, and doing the Mission on Heroic you are given a task, mine is to disassemble 10 rare or legendary Fusion Rifles, guess how many Rare Fusion Rifles the game has dropped for me? None, I've not got a single Fusion Rifle, I've recieved all other weapon types but not a single Blue FR, and I've been stuck with level 14 Armour for days because the game won't drop any for me, I even had a purple armour engram and at this point I would have happy with a Blue instead I got 2 Motes of Light, I'm convinced this game has been designed to bait you, so you either rage quit or keep on coming back for more hoping for something better.