Bob K’s review published on Letterboxd:
Crazy, stunning ultra-espionage film that starts amazing but can't keep up the impossible pace it sets for itself or figure out something to replace it. It's openly a film where things will only make sense in retrospect, but even then there are glaring inconsistencies and flaws. Unfortunately, a bunch of these revolve around the use of the Kat character, even though Elizabeth Debicki throws herself in and does some of the best emotional work in the film (aided perhaps by having played essentially the same character in The Night Manager). Kenneth Branagh also helps in those scenes, and perhaps his Shakespeare helped him portray a completely irredeemable bad guy as a character with depth.
Really, if they'd said at the end that the whole film had been one of the dream missions from Inception it would have made a lot of sense.