Missed Opportunity
If you've seen the George A. Romero original, that had a lot more of the slow, creeping dread that I think is integral to a horror movie. The sense of the walls closing in with nowhere to run.
Here, it's a lot of jump scares with the story being a much lower priority. It takes to about the 2/3 mark in the film to get to what's happening.
The nuke (or whatever it was) made for the one part where these filmmakers took things to a further level than Romero did. But, that was it. Too bad.