why you didn't like the movie
Of course people are not going to like this because instead of focusing on the pandemonium after the end of the world of people struggling to survive in the noise and chaos, the movie is painfully slow, making you think and feel and experience the totality of the acidic fear of extinction. It's purposefully slow so that you can feel its doom. The end of the world, is not a heroic battle to the last second, it's a heavy weight of all the stories and all the marks we've left on this earth, and all the buildings that one day we might leave empty.
It's scary and unpleasant because it is so close to reality. It doesn't matter how we don't want to think about it. It's true that any day a biological attack, or a nuclear attack, or even an apocalyptic climate event, could happen at any moment. We have the technology now to wipe the whole race out. And we can't do nothing about it.