nothing wrong with using shotguns in pvp
i would use
epilogue or crota HG
void shotty
truth
and stay in a pack at the back to steal kills with the HG or epilogue
use shotty in close combat situations
whenever you hear heavy ammo incoming run to it and camp
the truth is the best PVP launcher in the game bar none, look at some youtube videos to see how to use it effectively which is basically stand far away aim and fire as soon as you hear the beep
Yes I know.. my comment wasn't entirely serious.
I prefer using a High Impact LMG (in my case a Deviant Gravity-A with field scout) in PVP simply as I tend to rack up more kills over the course of the game than by using a rockets. Ultimately though it down to personal preference.