My guess is that the studio knew the adaptation of such book would make a mediocre movie, and decided to save the effort and go straight to mediocre movie instead.
I guess it doesn’t have a likeable protagonist per se and is mostly episodic. Maybe it would work better as a Tv show instead? Still I came away disappointed.
I didn't hate it. I just didn't like it that much. What most stuck with me was that it seemed like it required a string of unlikely events/coincidences without which you wouldn't have had a movie. So, yes, episodic in that sense.