First of all, there are a bunch of bots that keep giving this a low rating. Obviously those ratings are politically motivated. That's all I'll say about that. As for a REAL review, this movie kept me guessing all the way to the end of it. Halfway through, I stopped the movie to check where my local emergency shelters were. (It's always best to be prepared ahead of time.) If something similar were to happen in the real world, most of us would be lost since we do tend to rely on technology. All of the different things that happened are valid and some have happened in other places of the world already.... I think that is what makes it so scary. My anxiety levels were high throughout the movie because I actually do pay attention to real world events. Everyone should watch it just to be better prepared.