As long as the storyline is interesting, no matter how long it is, I won't feel bored; but if the storyline itself is extremely dull and boring, I won't be able to keep playing for even a second. It's not just about the common thread.
I'm not sure whether it could be said popular in my area, but in the community at least thousands of people could discuss different otome games. It is enough for me as otome game is always niche type of game, no matter where I guess.