The title perfectly describes the plot.

Special effects, lighting, art direction, sound, and all other aspects of technical production were on point. Why didn't the makers put together a decent script?

No only were the characters thinly written, but the the story was conveyed nigh incoherently. I understand the strategy of withholding information from the viewer. This requires a broader overall knowledge of the lore/mythos/backstory/whatever you want to call it, and the script did not provide anything that suggested the bigger picture of what was going on. This could have been a horror movie on par with The Thing, Hellraiser and everything else reviewers have mentioned. Instead it provided little clarity and context, settling into a pattern of creature attack and panic amongst those still alive. The monologues toward the end contained vague allusions and poorly articulated motives when clear explanations were necessary. This movie had an aggravating way of baiting us with cool imagery without the correct story to support it.

I don't champion the trope of "we need to care about the characters". However, we need some sort of investment, especially with those who end up surviving (which in this movie relies purely on luck). The movie did not give us a single moment to explain why the cast could not have been a team of elite soldiers or a bus full of mentally handicapped hot dog cart operators on their way to a national convention. This badly needed a complete rewrite.

We saw a primely executed movie that contained a lot of empty air. Curious to see what this production team would do with a story driven by plot, character, or any of the elements that go into writing the actual script. Solid visual effects, though.