system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] After their first battle, it seems so much easier for Superman to defeat Doomsday, i.e. no deaths, serious injuries etc. What changed?

Superman DIED, as the result of their first battle. And even if he didn't, his suit was torn up, and he was bleeding profusely. Yet, every battle after that, Superman seems to be relatively fine. 

What gives? Superman didn't get THAT much more powerful -- is it really just down to more experience?
gpt
During "*Death of Superman*", it was a major plot point that no-one knew who or what Doomsday was. No-one knew where he came from, what he wanted, what his powers were, what his weaknesses were, even what his species was. He just burst out of the ground and started killing people while the superhero community was scrambling to react to the sudden disaster.

As time goes on and we learn enough about doomsday to know what will and won't succeed, what things he's likely to do, and how to prepare for him showing up, stopping him becomes much easier.