Nothing kills a drama quicker for me than mediocrity.
Generally, even if the drama is bad, they still throw some enjoyable craziness at the viewers that keep us watching for about one more episode. But when the drama continuously throws crazy trope after crazy trope, the trope themselves lose their spark themselves become boring. They become the very thing they say they are not, they pretend they are not. And the only way to illude you to that is to make sure you don’t think while watching it, to make you keep thinking something is happening when it is not, because when you do it becomes nothing but a pretty looking eggshell with nothing inside.