Make the vendors useful. Most aren't. Make the ships do something other than serving as loading screens. Vanguard marks to buy faction gear. A place in the tower to test weapons. Dynamic patrol. Enemies that as you kill them respawn stronger. And in larger numbers. More diverse bounties. More public events and different ones. Vog weapons should be updated to 331 damage. Vog should have a level 32 difficulty with level 32 gear as reward.