I liked the idea of fatboy, because i thought it ll be more challenging for the hard hitters - as they get fat they are easier to kill. BUT OH WAS I WRONG. Since their hitbox doesn't increase, you lose concept of where to shot, specially when they are coming around the corners so you just shot through that extra fat. So in the end they are just getting rewarded and are harder to kill

And increasing hitbox is probably very hard to achieve