Why does the hemlok exist?

In the end, it depends from player to player, and platform too. I for one, on console, the guns I stick the most with are the R-301, Volt, and Longbow. I avoid the Havoc like the plague. Its so useless without the turbocharger. 

And the Wingman isn't that much better. I hardly hit anything with it on controller. I am not kidding, I can shoot 3 mags at the enemy, only to land maybe 1 bullet or 2. I just cannot get any kills with it. However this morning, I decided to give it a go on MnK and I got 6 kills already in 2 matches. And I haven't played on MnK since october 27 so I was bit rusty I guess. But it was definitely easier to hit things than on controller. 

I also like to use the G7 and the 30-30 on PC.

Lately I am avoiding shotguns on both platforms though. I don't know, but honestly, it feels like the damage they put out is just random.