Yes. Aiming the gun is easy
Yes. The range can be annoying
Yes. Almost anyone can use it effectively from day 1
But being a GOOD shotgunner isn't easy. Top tier shot gun players have immense skills in movement, pressuring opponents, and split second decision making.
I'm not defending shotgunners because I am one. Most people who know me, know that I snipe 99% of games. But it's kind of bullshit to discredit the skill set of another player.
I personally find using shotguns effectively very hard due to my passive nature, so when people make the statement that they take "no skill"... well I must just suck really bad. Right?
Watch the video, actually listen to my argument, then debate it all you want.
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IMO, getting a kill with a shotgun requires minimal skill. Just aim in their general direction and squeeze the trigger. What does require skill is closing the gap, and picking your gunfights. It's pretty hard to warrior someone with a shotty head on (unless you have Juggernaut or Blink), so pushing is heavily reliant on your timing and your judgement. That's why I'm pretty bad at shotgunning.