Videogames are not movies.
Tell that to the Warcraft film. And Spiderman game too.
Gradation is a concept. Story which begins with a big boom then fade out on the end are not very often, becouse they are not very successful.
You know, its like to see a girl on the street, come to her and say: Hey you, come here we are going to have a babies. That will not work. Gradation is required.
That concept when something start then grow then explode. That is I am missing.