The reason why they nerfed it is because people like you use the gun to destroy pve content in a matter of minutes and complain "I'm bored these fights suck and destiny lacks content."
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Lol game still lacks content
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At least now it'll take you a bit longer to figure out without unlimited ammo
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The weird thing is, you can still steamroll the entire end game with vog weapons. Some of the nerfs were justified but black hammer's seems like they said -blam!- it. If anything they should have lowered the impact and crit multiplier so that its harder to stun lock bosses. Or just change the perk to something else, idk.