Shotguns are fine, the only outlier being felwinters with its mapping capability.
I think the real issue being the abundance of special ammo
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They're really not, check the usage dominance. It's Snipers (nerfed) or Shotguns overwhelming all contenders. Yes, special ammo, as mentioned, is a big part of that.
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Shotguns have already been nerfed 2 or 3 times since D2 released ... they used to hit even further when HCs were much better too.
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Micro-nerfed. Exotic-buffed. Special ammo buffed. So now there's a diversity problem and there's nothing being done.