The shotgun is disproportionally overpowered
While the other 3 main guns are "okay" in their level the shotgun absolutely shreds through EVERYTHING.
Combining it with the Speedster + Machine gun, building a movement speed hero and just generally SHIFT+DELETE-ing everything on the map, by the time you get to the boss it's just hilarious. The whole 10 shell magazine is emptied in around half a second. Depending on the jokers you found during the game, this could mean 50+ damage. PER PELLET. My filthiest case was the train boss (Very Hard diff) erased from existence before it could finish just one circle.
It doesn't even need proper aiming, it's immute to Consumer joker, it has an okay range, elemental damage chances seem to be per pellet. It's just simply disgustingly overpowered compared to the rest of the entire game.
Nothing stands a chance. The lich can't even finish it's crying animation before it's erased from history. The horseman is just pushed aside like a common grunt. Bosses? Absolutely shredded down to quarks. Especially those with large weakspots. The only "brake" it has is the ammo limit, which is sort of a non-problem with how commonly the ammo boxes are. Especially if you have the Ammo Supply joker. With Reload Mastery, not even the reload time poses any problem.
I'm not sure if the shotgun needs nerf of the other guns needs buffing, but at the moment it's really asymmetrical.