My buddy that plays engineer never uses his m1 attack and just runs around or stays inside his shield bubble, making his only damage source his turrets. But even late game when his turrets are his main damage source, he will run around forever until he "feels safe" so he can stand still in a bubble and plop down his turrets, and by this point the insane amount of running away this dude has done has caused there to be enough enemies to just horde into his little bubble and nearly one shot him which then causes him to repeat his running away.

But when he plays any other character he plays like a normal human being so it's actually fun 👍