veigar has amazing burst and really it doesn't matter how much total damage you did throughout a game, if you insta kill enemy damage dealers before they kill veigar then that sets your team in advantageous position.
stats can be deceptive if that's all you look at.
damage over time is tougher to secure kills with, since enemy have time for spell rotation and turrets to run to.
I will say that mundo esp, is thaat much stronger at zone enemy and thus allow his team to secure objectives.
I think mundo could have exact same kit but whenever targeted by turrets esp inner turrets his regen could be comprimised.
and maybe give ohmwrecker a more defensive ability against tanks exclusively. so like create a turret on broken towers that dmg wayyy more if the enemy has a lot of hp and armor.