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  Originally, I had posted this CMV as a way to generate discussion.  But I see now that I'm just wrong.  The writers had their own reasons for inventing Doomsday.  Thanks all!
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  Here are some things central to Hulk's character.
  He has an alterego. And unlike most heroes when he was introduced, it isn't a matter of a costume and constant powers, the powers are a blessing AND a curse, the identity of the monster and the identity of the man are, for much of his formative arcs and many years- in conflict in various ways. Obviously Jekyll and Hyde was the core inspiration, and the writers clearly meant to explore the same Freudian themes of the id within us.
  Doomsday has no alter ego, he is pure monster. He is not at odds with an internal humanity, he was never human.
  The Hulk's origins are accidental and modern. His personal background exists within the modern era
  Doomsday's origins are ancient and deliberate. He was engineered.
  The only commonality is that both are big muscley dudes whose main power is immense strength channeled through animalistic rage. But they're not alone in that power set. The big dumb super strong rage beast is a staple of storytelling throughout comics, genre fiction and many media. >
  
  
  I believe the writers sat down and decided to answer the question what would happen if an enraged “world breaker” Hulk was plopped down the DC Universe. 
  
  Nope: 
  “Doomsday was conceived in 1991 during an annual brainstorming session with the editors and writers of Superman comics, in response to a concern by some writers that most of Superman's foes at this point either relied on technology or their intellect to outmaneuver Superman or had some natural advantage against him, wanting to create a new foe with great physical power to match him. Several writers proposed having Superman die at the hands of a "bestial foe", and editor Mike Carlin scribbled this idea on the wall chart as "doomsday for Superman"”
  The writers were sick of writing him “fighting” eggheads and having to come up with another wacky scheme for him to foil, so they said: have him fight something who’s only desire is destruction.
  Edit:
  But how would they knock off a nigh-invincible man who’d survived all manner of threats since his 1938 debut? They’d need a villain to do the deed. By coincidence, Superman writer–artist Dan Jurgens had been kicking around a separate, simple story idea: “monster rips apart Metropolis,” as he describes it now. The group opted to combine the death with the monster. It would represent a change of pace from the more cerebral villainy that had populated the Superman books in recent years. “At that time, Lex Luthor was a businessman, Brainiac was more or less non-powered, and villains like Toyman and Prankster had no powers,” says Jurgens. “I just wanted to draw a knock-down, drag-out fight.” >
  
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  Originally, I had posted this CMV as a way to generate discussion.  But I see now that I'm just wrong.  The writers had their own reasons for inventing Doomsday.  Thanks all! >
  
  Thanks!
  There are a couple of direct Hulk rip-offs running around the DC world.
  Loose Cannon - Straight Up Rip-Off
  Rampage - She-Hulk-ish Rip-Off
  Blockbuster - 70% Rip-Off
  And, the entire Red lantern Corps - Powered by rage
  A case could be made for Doomsday in the abstract, as you did, but he was primarily created to kill Superman. >
  
  
  Doomsday was conceived in 1991 during an annual brainstorming session with the editors and writers of Superman comics, in response to a concern by some writers that most of Superman's foes at this point either relied on technology or their intellect to outmaneuver Superman or had some natural advantage against him, wanting to create a new foe with great physical power to match him. Several writers proposed having Superman die at the hands of a "bestial foe", and editor Mike Carlin scribbled this idea on the wall chart as "doomsday for Superman". Inspired, they chose "Doomsday" as the name for this villain.
  
  So they wanted an antagonist for superman that relied on brawn instead of brains, and you've gone "oh well he's strong, so therefore he's a rip-off of the hulk" But he regenerates from any injury - is he a rip-off of Wolverine as well? He's barely sapient - is he a rip-off of Solomon Grundy too? He's Kryptonian - is he a rip-off of Superman? etc etc