Most champs specially frontlines come so strong or OP let's say but they end up heavily nerfed and then unnerfed and then nerfed again or balanced which is rare, but I hate those "delete x champ he's op" threads because let's be real here, that will never ever happen so please just stop it already!
If Atlas kept overperforming he will be nerfed before you know it, trust me, just learn how to counter him for now.