I don’t mean stuff that was obviously bad on sight (to you) and so you didn’t bother with, or even necessarily content you just checked out of before the first episode was done. But a series that you ultimately felt wasted your time and abandoned due to its total lack of quality.
I watched 8 seasons and read the comic. There was a turning point that where the theme changed from the decay of the old world toward building a new one… and the theme song needed to change to incorporate this. Then I realized the theme song was the best part.