If the game never gave repeats, I would have gotten every exotic in game by now, even the ones for the other classes. Currently, I am still missing a ton. I feel like Bungie made the drops for exotics far higher than D1, but because of that, they give us more duplicates. I have gotten 5+ of certain weapons or armor pieces. They should probably tone down the drop rate slightly, and make it slightly more likely that you get exotics you don't have.