Nothing wrong with the writing of Halo 5, the point with Halo 5 was it was chopped up into 3 different parts. A trilogy which means that Halo 5 had to lead up to what's next. The story has already been written awhile ago and if you have finished Halo 5 on Legendary you will be excited with Halo 6. There's much more to come in the Halo Universe. Even though Halo 5 didn't live up to expectations from the adds, it still has one of the better stories for a FPS game.