Bungie, here is a suggestion to do with exotic weapons. Maybe instead of boring bounties we could have a new side quest/story.
Take the last word for instance. The story behind that gun is really interesting, you could have started out with a cutscene of the narrator/child pushing throug the crowd, Seeing Jaren ward, being handed the last word.
Looking at the size of it in the narrators hands, the intricate details on the barrel. The way it glistens in the light. Reflections of peoples faces on the reciever as the child moves it around in the air.
That would make me want to play the hell out of that side mission to get that weapon. Then you could do 3-4 story missions in the perspective of the child growing up perhaps, where you have to save a few civilians and clear a village of fallen etc....
Finally it could have ended with the cutscene of Jaren putting a round through Lokens head. As he falls into despair he drops the Last word on the floor. The narrator takes the gun and buries it in a village somewhere.
You then have to (as your guardian) go to the village and locate the weapon.