Tenet is the smartest movie of Nolan's career but it is too clever to get understood by the majority of audiences. The special effect, cinematography, music and set is just phenomenal and story is way beyond imagination. But what it lacks is the involvement of audiences in saving the world. One can hardly imagine what amount of hardwork might be required to put the story onto the screen. It must be quite complex to write the screenplay with normal and inverted sequence together. It is definitely lacks some general idea of entertainment but it is a masterpiece way ahead of its time.