I don't know how you can possibly think this. The range of the shotguns is pathetic. They are terrible weapons, and the nerf just made them completely useless. The only way they are good is if you camp or if an enemy runs right into you. Perhaps what you see is their extensive use. But just because a particular weapon is effective does not mean it's OP. If all the maps had no cover, snipers would be overused, but not OP. The reason you perceive shotguns as being so OP is because of the monotopographical maps. They all have tons of cover and force almost all play into very tight spaces where it's easy to camp.