I think the game would feel more alive if the missions had friendly npcs you might fight alongside, or get information from, in the Darkness zones. For instance, in the first Moon mission, if you had found the Guardian outside the Temple of Crota, and fought with him to get into there and retrieve the information, it would seem more fulfilling rather than running into his corpse, and having your Ghost inform you. As it is, there's no Guardian npcs you can find, or talk with to get any depth, other than other silent players who Dance or Wave. I felt that Halo was very fleshed out by the UNSC Marines and the companions who helped you, in a way that I haven't really gotten from Destiny (yet).