I wanna create 100 articles, each for a city. Their content is similar, only the name of the city and the information about the city is different in them. Each has its own URL.
Is it bad for SEO?
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Google would call those doorway pages. The Google webmaster guidelines prohibit the creation of doorway pages. They even call out what you are wanting to do in the examples:
Having multiple domain names or pages targeted at specific regions or cities that funnel users to one page
You are welcome to create a page for each city, but each has to have:
I have been using this method for many years and have yet to see any website suffer and normally the sites average 200-500 pages.
Here is what I do.
Some may not agree but I am just going by my personal experience.