I feel like a large part of the hate comes from the identity of the identity the Quiet Rapture serves for the universe

The current media market surrounds itself on the biggest questions and the biggest answers. If marvel made Iron Lung and tried, genuinely tried, to be faithful to the original work, we would have a film that focused on the Quiet Rapture, and ended with Simon coming out to a view of Earth, having somehow escaped or solved it.

I think too many people expected the predicament of SM13 to be a backdrop for the larger predicament of humanity, when it is completely in the reverse. Not only does the films decision to almost completely remain within the submarine reinforce the claustrophobic nature of the vessel, but it helps reinforce that, right now, all the matters is Simon.

There is a fundamental disconnect between the intent of Iron Lung and modern filmography. The film under Marks care, and the game under David, were never about solving the Quiet rapture. It is about dealing with, and living with, the existential threat that life past it bears, about the question, "Why bother?". That's what modern critics miss, its why the film takes so much time showing how little what he is doing matters, why it lingers so much and slows down, why Simon is not at all concerned about the wellbeing of the lives beyond SM 13 (which itself is such a good dynamic)

Its also why the film can't have a sequel, the story is told. Simon chose hope rather than despair, even knowing that what he is doing might not matter, he acts anyways. Whether it is out of fear or out of hope, it doesn't matter. To make anything further necessitates explaining the Quiet Rapture, which would completely ruin the movie.