You can argue that if a videogame didn't engage people or didn't manage to capture the time of anybody then it failed on it's porpuse, if an entertainment piece of media, wherever it is a game, movie or novel, fails to engage people it is a failure.
Papers, Please is a game that engaged people, they got enjoyment out of it's existance, narrative and message, it was entertaining in its own way, that means P,P succeeded in engaging the audience, thus it was fun to the people who enjoyed the experience it had to share.
Y'all need to stop giving the word "fun" a childish, demeaning connotation.
You're not more mature for saying your "adult" games are not fun.
I was specifically responding to that poster about his definition of "fun," I'm not trying to say that fun has to, by necessity, denote childishness.
What I am saying is that fun is an ambiguous and not very useful term for analyzing why a game works.
"I like Overwatch"
Why?
"It's fun!"
What makes Overwatch "fun?"
*reasons x, y, and z*
Okay, do you think Super Mario 64 is "fun?"
"Yeah that's a fun game."
Why?
*different reasons a, b, and c*
(please note these are just examples I came up with off the top of my head, you can substitute any two games that are popularly considered "fun" in this example)
The reasons why one game is "fun" can be wildly different from why another game is also "fun," meaning it is such a subjective term you're better off just talking about reasons x, y, and z and reasons a, b, and c instead.