Complex series with ongoing storylines can be great but they also get a bit exhausting after a while. There is a definite limit to how many Game of Thrones or Lost plotlines and character backstories one can keep in one's head when you just want to sit down and watch some TV.
It's fine that there are TV shows that are basically crafted for uber-fans who want to carefully watch every episode multiple times but these shows often aren't for the casual viewer. And there's nothing wrong with being a casual viewer.