Currently when facing the top-of-the-line-for-crucible auto rifles you can barely even get a second shot out before dying when facing someone with even a modicum of aiming skills let alone a third shot let alone actually aiming for headshots while they bunny hop around the place.
Also shotguns and fusion rifles are really inconsistent at times, and shotguns need to have their ability to one-shot-kill removed when it is already possible to do shotgun+melee if you fail the OSK.
I don't even see pulse rifles used except by newbies to crucible because auto rifles just outclass them so badly.
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But...it is. The last 2 pistol's I've used in crucible were 2 hit headshot kills, I use it for exactly that reason. Maybe get one with better impact (both of mine are just barely not hitting the maximum for impact)?