Just to clear up a couple of points:-
a) This is a FILM, not a computer game. b) CGI people don't look or move exactly like real people. That stated, Aki Ross is still a more convincing character than ANYONE played by Keanu Reeves.
Final Fantasy is misnamed; there's little about the story that is "final", nor is it especially fantastic, but what it IS is a pretty decent mystical-science fiction (no, NOT "sci-fi" space opera) yarn. Possibly owing to the real inability to successfully portray facial expressions in the CGI characters, the mood throughout is sombre and hard... so rather more like real life than your average Hollywood space-opera swashbuckler. Frankly, because this story actually tries to make a POINT, it probably disappoints the type of viewer who would like a film like "Aliens". The overriding message is simply that brute force is no use without understanding, and that's a timeless message that many cultures would do well to think about.
And, of course, this film is just BEAUTIFUL. Probably best watched while tripping on acid, if the truth be told.
7/10 and a future classic, as far as I'm concerned. This film will be remembered long after things like "Starship Troopers" have been forgotten.