I don’t think there is a common definition of “game” out there.
Let’s at least call it an interactive cinematic experience. You interact with it and doing that, modify the outcome (or at least should).
What do you consider a game?
(1) "Almost everybody [who played the game] loves this game
I don’t know if they changed it. But it’s 5 euros per episode and you can’t buy each episode separate. So it’s 22 euros total (or 20 if you buy the whole package)
See (1). People who bought Life Is Strange probably don’t care about action.
Probably this. I didn’t play The Order but it sounds like a solid reason
I assume many people can relate to having a hard time in school/growing up.
I think the toony art is due to the amount of content the developers need to create. Doing a similar style as the Telltale games can also be considered marketing (putting story/content first). E.g. for me the expectation was to have a story intensive game. I don’t care about graphics if don’t expect them to be great
So yes, I think the reason most people (who played it) loved it, was that the people who would not love it, stayed away from it.