One of my smaller gripes I have with Destiny is how the npcs never really contribute to the story we play besides talking a little or giving our character some gear. One of the things I liked about halo was having the marines there to do some of the campaign with you. It really felt like you had an army of soldiers there to support master chief when he needed it. They would be valuable as they could take damage as well as dish some out. (Also you could kill them and have allies becomes foes). I remember always having some character important to the story like sergeant Johnson or Arbiter there to take bullets for you and to shoot some back, and honestly I wish having someone like zavala there to support our guardians, or even just random extra guardians that we see in the trailers but never actually meet, be there to support our guardians as we progress through the story They kind of did it with the first couple of missions of forsaken, but spiders men weren't really useful as they did no damage (and were completely unshootable despite Petra telling you to not shoot them). It's nothing that HAS to be included in the game, I just think having more ai or npcs in the campaign would make it a bit more interesting. And I don't mean the cutscene style interactions they gave to cayde. Zavala being there to put up his bubble for you in the beginning of the game, something like that just more.