I never player halo. And the thorn bounty is the hardest of the exotic bounty weapons, but it's one of the best weapons in the game now. If you are a void walker, with atheons epilogue and a special and heavy void weapon, you can go 0.5 kdr for every single game and still get the thorn. Even for average pvp players like myself it's not hard, just takes a little time. It's well worth it. Stick with it.