Mauga’s in a weird case where he wins tank match-ups, but loses generally to dps/support picks. I’ve had my butt destroyed by better hog players on Mauga while at the same time playing into Mauga on Sig/Ramattra and had them get off the character. I’ve won games on Winston because I ignore Mauga to kill his backline and strip healing from him.
He’s overtuned for high ranks, but possibly mid-ranks have no idea how to play against him well enough to beat him regularly. Many times I see players like to shoot the tank including the tank in mid-ranks. Which Mauga will win every time unless you pick the right comp for that.