I have seen multiple instances of Doomfists being completely frozen but still killing the Mei. I have seen multiple instances of me as Ana being dead from a slam with the Doom landing on the ground sleeping.
In both cases it is kind of obvious that the ping wasn’t bad, otherwise freeze or sleep wouldn’t have gone through and Mei/Ana would have just died. And I know what I am talking about when it comes to sleeps being eaten mid-air by Hog hooks or some other stun-abilities. If the sleep was too late for the server, the sleep just wouldn’t exist and the Doom wouldn’t be sleeping.
Not arguing about the ‘Doom has counters’ thingie here. I think he is too strong in some ways that should be fixed, but I wouldn’t say that he has no heroes to counter him.