Vault space. I don't bitch about not getting Gjallahorn, I don't bitch about getting a pulse rifle from nightfall, I don't bitch about not getting Black Hammer or at least Light of the Abyss instead of 3 helmets. I bitch about vault space because I'm a collector and you have no idea how mad it makes me to not have enough space. I hate using my second warlock as a second vault, I want to see all my maxed weapons in my vault. If I feel like using a certain gun the I want to go and grab it, not switch characters, deposit, switch again and go back to tower.