Wingman isn't overpowered as it heavily relies on you landing the shots in the first place to be useful. The Mozambique can 3 shot drop someone if you know how to use it right but no-one is crying that it's overpowered, instead it's become a meme of being terrible.There are a couple of things they need to change with gunplay - bullets are too slow, need speeding up slightly.
Wingman is well too overpowered, its a beast long and short range!
If EA fix the issues with PC crashes it's going to stay ahead of Fortnite for a long time... hopefully!