The only reason shotguns are so bloody strong and annoying is there isnt very good counters. Side arms are good but not super reliable. And smgs are just garbage. A small buff to those and maybe in air accuracy would help quite a lot.
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Not saying that SMGs don't need a buff, but the root cause of shotguns being overpowered is the map design. Too many close corners, doorways, hallways, small rooms, etc. I don't think this will change but just saying.