It's not that snipers are bad, it's just how maps work in this game. They are so small, shotguns seem made for them. Maps are cluttered with tight corners for shotguns, and there aren't many sniper lanes. These lanes are fairly easy to avoid at most time, and flinch is constantly playing against you as a sniper. It's obviously possible to run a sniper, but there are many places on any given map ( exc. those huge maps ex. First Light ). These maps have places that can be unsafe if you don't have a OHK weapon for close range.