Terrible writing: absolutely terrible characters, terrible dialogue, terrible story-development. And, besides, probably some of the worst WW2 American soldiers ever put on film, not all of which seems even intentional.
That the plot would be dumb is kind of a given, but this is just incompetent, and given the cheesy bloat and self-importance of a big production to make it fully insufferable. The dialogue is the kind of terrible that is not merely hammy and clichéd, but the kind that knows it can be clichéd and "not smart", and therefore is satisfied with just being plain bad.
The characters are so awful, one can't call them characters, but just attempts at ones which are played by actors with specific faces. The same as for the dialogue and plot, their "deliberate" attempts at being awful are indistinguishiable from them just being badly written.
Yes, some of the things we are shown are also somewhat "terrifying" (actually just a small selection, which by the way doesn't include such attempts like a jumpscare by a soldier seeing an ordinary corpse in WW2), to get that semantic ambiguity out of the way, however the movie is unbearably bad and not entertaining after the basics are established...
