Savannah Oakes’s review published on Letterboxd:
I will always respect Christopher Nolan for trying to convey interesting concepts, often with complicated and unfamiliar filmmaking techniques, to a mainstream audience with his blockbusters.
Unfortunately, Tenet is a failure in execution. Its filmmaking is occasionally interesting but never plays with its own tools long enough to be mind-bending. Nor does it use enough of those techniques to support the endless exposition it imbues trying to bolster its main concept.
The result is a movie made of telling a concept, mostly not showing it, and leaving most audiences more confused than excited by the prospect. Even the subplots of an abusive marriage doesn't lend enough emotional residence to latch onto.
You could easily watch this movie backwards and be just as lost.