User blog comment:Zenzizenzic/Question.../@comment-27304481-20160403201648

I think its content and quality of response and adherance to guidelines. Some rps can have looser responses that neither leave to the imagination nor describe thoroughly, and that can leave it unsatisfying.

And guidelines I find are important as well. For example, rps that encourage OPness Generally burns fast and hard, and ultimately do not last. On the other hand, limiting creativity of abilities can also create difficulty, and limit demographic.

And the host of the rp is also important. They make it clearer or leave it be, keep the story straight, while not limiting natural progression of subplots(such is life. Subplots happen, we just need to not strive for them).

So, in a word, I don't think it's the plot. My highly opinionated and potentially hypocritical answer is: Users.