What is the most important thing in a Scenario/Campaign? Auto-translated

It would be very interesting to know what is more important to you...
1. Story
2. Atmosphere
3. Difficulty
4. Something else...

This information is very important to me...
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*Don't forget to explain your answer or provide examples.

They shouldn't have made it a multiple-choice question. And they should have added more options, for example, uniqueness (some special features), faction (many people play based on this principle)...
I chose atmosphere because, in my case, it's what determines my main interest. Of course, other things are also important, and besides, atmosphere isn't entirely a separate point; it's made up of many things. But still.

Thank you for your comment, Ment. I will keep it in mind for the future. These three parameters are common to all campaigns/scenarios... some have more, some have less... --- *This is my first topic...

Atmosphere, plot, balance.

Actually, the author has already listed the main points – difficulty, plot, and atmosphere (without any of these elements, interest in a scenario or campaign quickly fades). And also balance, but that's a tricky thing... it has to be adjusted as you go.