A question with many answers.
Slow developments. Not all, and by that we mean a great number of stories, aren’t able to fully capture and retain the audience’s interest in the very first episodes. They take their ti
me to develop and sometimes they take a lot of more time to develop and transform themselves into the fantastic story they were meant to. The good thing about them is that they turn out amazing when they do and they make feel good about sticking with them. The bad thing are those other times when it doesn’t pay off to follow them but it’s too late to drop them by then. The thing they all have in common is that they all involve a decent amount of episodes to go through in order to get your answer.