Because you can counter it. Sit around a corner and shotgun him. Team-shoot him. Snipe him. Solo him with a primary if he's bad or if there are multiple people around. Remember: Golden Gun doesn't have any damage reduction. HoS: can't sit in a corner and surprise him, because he can chuck a hammer on the ground next to you. Or, it'll proximity explode next to you. Same if you try to out-maneuver him, the proximity hammers will get you. Can't 1-shot with most snipers, and it's tough to team-shoot him because of the damage reduction. On top of that, he regens health after a kill. It surpasses Golden Gun in pretty much every way, so that's really not a good comparison to make!