My opinion on Tenet is that, in an alternative universe, it could have been Nolan's first blockbuster...
I mean, it's got all his trademarks: the non-linear structure, the logistically impressive action scenes, the heavy soundtrack... Except that everything seemed out of control.
As if the director hadn't yet mastered his vision. Does this make sense?
The script, with its Russian villain who wants to destroy the world via a fantastic gadget, has always reminded me of a Roger Moore-style James Bond story. It's super simple and quite caricatural but here, it's been splintered into a puzzle that's certainly very ingenious on paper, but which I found far too muddled as a viewing experience.
For me, it's a film that (like Oppenheimer... sorry) lacks focus, an external “guardrail”. This is going to sound harsh, but as much as I've always liked Nolan, now that he's the sole screenwriter on his last few project, I can understand the "self-indulgent" criticism his detractors have been making of him for a long time....
I still plan to revisit Tenet and Oppenheimer to possibly adjust my opinion, but I never find the motivation to get back to it....
That said, I still love what I've always loved: The Prestige and Interstellar are forever untouchable for me.