El Camino - A Breaking Bad Movie.

Ok so I know the plot of Braking Bad but I've not seen the series.
I've just seen the movie, and probably without seeing the series too much pieces are missing. The movie is very slow and at the end too many things has not been explained well.
I think that a movie, also if it's based on a TV Serie, has to be clear enough also for who has not seen the serie.