Got to see this with my film club buddies at the IMax theatre. Amazing spectacle of a film visually and sonically, I can see why Christopher Nolan insists people to watch in a theatre. The acting is fantastic. Kenneth Branagh has a talent of chewing everyone around him no matter how good they are, and Robert Pattinson once again shows he's got some great acting chops. That said, it's not for casual film viewers and needs a second or third viewing to get a grasp of what's going on.
The film blurs the traditional 3 act structure and moves at such a breakneck speed that it doesn't give you nor the characters time to breathe. As a result, it's probably the most emotionally detached movie Nolan has ever made. I guess Tenet was made to actively challenge the you on questioning the perception of how a traditional movie is shown in the most needlessly complicated way possible, something we'd expect from Nolan by now.
Considering he lost me at Insterstellar and Dark Knight Rises, and even my staunch fanatic Nolan friends told me don't bother with Dunkirk, I'll take Tenet just fine.