I feel it's fairly balanced. You need to land 2 head shots to get a kill from the poison. If you nerf thorn, you nerf its counterpart, red death. Exotics are meant to give advantages to the players that own then, and each one is different. At what point does Bungie stop nerfing then? If you want to play a game where all guns have no perks, go back to CoD and quit complaining.