No they aren't.
Shotguns have been nerfed again and again, they took shot package out and you need to be fairly close to oneshot people with one.
What more do you want ? 1000 yard stare and other sniper rifles are unbalanced too giving free kills to people because of their high aim assist yet I don't see people complaing about that.
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That's because w a sniper you actually have to aim, even w AA. Try to hit a running target w a sniper w or w out AA. It's not easy. Shotguns, you just have to get close and with these maps there are so many corners and pathways that everyone is everywhere. In his video these guys came out of no where a lot of times.