NLB is by far the worst Exotic gun in Destiny. It's a nightmare to use in PvP, it's absolute garbage in PvE, its Exotic perk is useless because you actually have to get a kill first, its sights take up half your screen and accomplish nothing, it takes a full 2 seconds to get off another shot after you fire it, and you are required to aim for the head in PvP to accomplish anything other than poking the guy. Honestly, you would be better off wielding it as a club than actually firing it.