Hmm, I see the dilemma here. Well, Let me say this, I do have a Exotic Auto Rifle called the Monte Carlo. I got it within about 30 or so hours of gameplay after the launch, my clanmate got the Universal Remote shotgun before I did, and he had less hours logged in. I put my rear to work, I did the same missions with him, explored the same planet, opened the same chests beside the same enemies we just killed, he just happened to be more lucky than I. He still earns more legendary engrams than I do, but he doesn't have better luck pulling legendaries from rare engram's either :P I have a legendary helmet and shotgun that I found from said engrams, he only found his chest piece from a legendary engram. The point im trying to make here is that I am still better off, though slightly, because I still put in more work in the same areas that we both run. And even if people are just lucky and pull the weapon, that doesn't mean they have the experience or the materials needed like you may have from your many extra hours logged in with your effort. Just keep trying, don't let it rest and by all means, don't give up. It will happen, much like it did for me while I was playing a desperate game of catch-up with my clanmate, and I still have more upgrades unlocked on my Auto rifle than he does for my hours I put it :P plus the extra Vanguard rank I need to buy other legendary gear that I still need to earn with hard work on the Strike playlist's or public events.