This film tells the story of Adam who may possibly be the last person left on earth. He tries to keep to a routine. He takes the rubbish out. He locks his front door. He leaves himself friendly voicemail messages. He imagines/dreams flashbacks to other people that were in his life, sometimes confusing reality.
I can see why it has so many negative reviews. The film is about the last human on earth but its not really a sci-fi film. It really is just about one man alone on earth. It is a slow film and nothing ever really happens. The film didn't explain what had happened to everyone else. There also didn't seem to be any living things around (apart from a single mouse). All the services appeared to work and there is no sign of damage or dead people.
I do not normally like slow films but I do like films about people, even if they don't go anywhere. This film doesn't really go anywhere. It is just about someone on their own doing little rituals and trying to do normal things in a very unnormal situation. I really found it fascinating.
I enjoyed it but can really understand why others don't. Ignore the situation and plot. This is no sci-fi film.