i think the biggest counter is pharah and junk... they can stop his combos and null his dmg to 0 i think they had 2 remake mercy... iam a mercy main and since the junk changes AND doomfist... it wasnt really playable anymore...
a good doomfist ( very less seen so far) is so damn op ... i think we will see him in the finals often , if nothing happens to his kit
I found Roadhog or any other high health char a great counter to him. He can do a lot of damage really quickly. But once his abilities are done. He's a sitting duck. His abilities cannot kill a high health tank.