TENET has a highly intriguing and complex storyline, and you may need to watch it several times just to follow each character's timeline and to know how each one of them is part of a much grander scenario. It will be tough for the viewers to follow as they'll already be struggling following the storyline.
Outstanding direction and cinematography, what it lacks is emotion. You know what's going on, but you still won't be able to feel for the characters. But it does make sense now, as the protagonist says during a scene, "Ignorance is ammunition."
Pretty sure it will become a landmark in cinema history and a cult classic.
8/10.