Well thunderlord is the same as legendary only it has high impact with climbing RoF, Truth has superior tracking, SGA can be fired a very long time. Damage doesn't really define these weapons as exotics, their unique perks do. Ghorn will have tracking cluster missiles and grenades and horseshoes, cool perks but nothing game breaking. Why it's damage output was so high compared to the others in the first place is anyone's guess Idk what Bungie was thinking. Ghorn should be brought down to the level of other exotic heavies.