Destiny really needs a damage counter, so it can show everyones damage like at the end of the dungeon or raid or even somewhere on the hud like an addon in world of warcraft, kill amount isnt enough to determine who is doing the best in a strike,its needed to for just fun and a bit of competition and to especially show who is slacking in raids for top end players etc.
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they must add a kill log too while, like in the crucible. i loved when i get a killing blow on other pvp games :D