The only reason it's always singled out as the most "op" weapon is because it's the easiest gun to tell you got killed by. The last word and red death are just as common but don't get nearly as much hate. I'm sure if they turned your screen green they would. Just my 2 cents.
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It is not as OP as you think it is. If you where to go into a match with a team of NLB, and you play the whole game with every death from NLB, then after the game your going to come out saying "NLB is op" because you have noticed how many times you were killed with it. And statistically, many guns can outgun thorn. Such as red death, the last word, hawkmoon, any shotgun, any fusion rifle. Then the obvious heavy weapons.