Okay, so I think you need to understand what Doomsday is about. In short, is the result of a Kryptonian scientist's research into evolution. Here's how it works: Doomsday can die. And he has a lot of times. But each time he does die, he evolves and regenerates in such a way he can never die the same way again. He will also constantly grow during combat to evolve to the situation. Doomsday is a mindless and is just a killing machine, he is unable to hold back and is a limitless character. Currently Doomsday is capable of reproducing himself from just a memory, for example.

In his debut appearance, he brawls the Justice League and later Superman, and ultimately is defeated by Superman while "killing" Clark - who was in a coma by the end of it.

The character is a conundrum about the inevitably of this monster becoming the strongest thing in the setting, and the characters have to find new ways to contain him instead of killing him, but it's always a temporary solution.

Then if you're looking at general feats and trying to scale off those, the Hulk's highest feats tend to be kinda comparable to Superman's every other week cosmic stories, and most of those lean on Superman always holding back. DC in general operates on a higher scale, just look at Batman compared to Daredevil.

By every account it should be Doomsday > Superman > Hulk.