I believe tenet was trying to be as complex as Inception, but failed. The main reason I think it was a not so good movie was because of how un-needingly complex it was. For the most part I felt like I was in a fever dream. Now I understood Inception but this movie’s complexity was due to information that you don’t get till the end. This leaves you with no perception of a story arc and you basically have to sit there and just soak in the extremely loud fight scenes. Also I thought this movies score would be a lot better that it was. All in all I would say it wasn’t the worst movie I’ve seen but it definitely was not the best.
I would say just wait for it to come out on dvd cause your gonna need to watch it a second time.