I'm not sure what you're trying to say here... I acknowledged that the backstory was one of the positives in the movie.
It was more of a companion movie. It showed the beginning of xerxes as well as the time of the 300 and slightly after the 300 fell. It was about the Athenians , and Eva greens hotness
In other words... the film was terrible, as the only thing that caught your attention was Eva Green...