There's nothing arguably better than writing a script and having it narrated on the big screen, only thing that further matters is how it's pulled off. Taking a look at a few examples of how narrations can bring about a sense of connectivity for the audience and stay closer to character development, are they important for this matter of fact that they headline what their movies are willfully trying to be? Let's proceed further with the few front runners on the list...
1. X-Men and X2.
Starting off with the franchise that brought a reemergence to comic book movies (Blade fans will severely disagree) or so much as a fresh start in the 21st century, X-Men 1 and 2 start off with a brief narration from Prof. Charles Xavier on what the fate of the humans/ mutants will sum up to be. Also, in the final scene of X2, we get the hint that Jean Grey isn't actually dead as they showcase her powers with the same narration from the first movie in her voice.
2. Spider-Man trilogy.
Remember the time Spider-Man was at his finest spot and had literally no issue with commercial and critical success? Well, let's just hope Tom Holland's Spidey reboot is as he believes will be, the most independent movie of the genre.
Spider-Man 1 starts off with a narration from Peter Parker about himself and the story of his life. It seems connective in approach and defines what a superhero should be. The ending is pretty much well paced with "Whatever life holds in store for me, I will never forget these words, with great power, comes great responsibility. This is my gift, my curse. Who am I? I'm Spider-Man."
Spider-Man 2 and 3 subsequently take advantage of this narrative sequence for their own progress and evolve it as necessary.
Right from where the twisted mechanism began, Mathew Vaughn's Kick-Ass had a really complex but well detailed narrative structure that enlightened us about various twists and turns and totally kicked ass, period!
An agreeably fashioned start with a free-fall you apparently forget until the very end which makes you like the movie a little more, plus a sharp narration at origin and the same fall in two different perspectives!
5. Iron Man 3.
So the Avengers' movie has happened and they've split again. Considering all the Phase 2 movies, this is one threequel that wasn't perfect for obvious reasons but stayed true to Tony Stark's character development with the intense narrative focus from start to finish and the little plus point with Dr. Bruce Banner, for after all Iron Man was the only one who had the full blast of the impact in the alien invasion at New York.
6. X-Men: Days Of Future Past.
Predominantly aware of two different timelines resulting in continuity issues, X-Men: Days Of Future Past's one objective is to completely erase the old timeline with the old Logan prevailing in the First Class timeline, given that his existence was also coincidentally in it. Plus, 1973 in both timelines where things are rectified and further executed in the revisited timeline.
The narration is more than just intense, it's SPOT ON! Like for instance, the foremost priority that the movie takes into account...
Intro with Old Xavier in the old timeline: "The future, a dark, desolate world. A world of war, suffering, loss on both sides. Mutants, and the humans who dared to help them, fighting an enemy we cannot defeat. Are we destined down this path, destined to destroy ourselves like so many species before us? Or can we evolve fast enough to change ourselves... change our fate? Is the future truly set?"
And then they crossover through Logan's conscience.
Ending speech by Young Xavier after the old timeline is erased in the revisited timeline: "The past, a new and uncertain world. A world of endless possibilities and infinite outcomes. Countless choices define our fate: each choice, each moment, a moment in the ripple of time. Enough ripple, and you change the tide... for the future is never truly set."
What more could we ask for?
In short, this pretty much describes how or why narrative sequences can be influential in this regard!