No matter how hard the graphic designers tried, and I'm sure they tried very very hard, the characters just do not look realistic. Their facial expressions are not perfect, their movements are not perfect, and their emotions seem forced. Everything is close, but not that close. In terms of plot, Final Fantasy has a pretty good one considering that it is adapted from a videogame. If they come in contact with humans, the humans die instantly, so most of the Earth is vacant of life.
Humans live in small outposts that are protected from the phantoms.
It has some elements of Terminator in it, in a way. The only real problem I have with the story is the focus on spirits, especially on the Earth's gaia, which is what the giant laser, the heroine claims, will destroy if the World Council decides to use it. I also didn't really understand where the characters came to believe such a thing existed, and how they figured out they need eight 'spirits' to create an antithesis to destroy the aliens, and how they find those spirits. Those are just some questions that confused me. There are only two somewhat big problems with the movie, one falling back on the graphics.