Andrew Curzon’s review published on Letterboxd:
This movie worked for me. It's got action sequences that remind me of The Dark Knight and a crazy premise like Inception. It's not as good as either of those, but it's enough to make it a great movie.
This was definitely the hardest premise to understand, but it all makes sense in the end. Kind of like how The Prestige was structured the same way as what the movie was about (a magic trick), this movie is structured like what the plot is about (reverse entropy). It's only when things start going backwards that it begins to make sense. We discover things as The Protagonist does and like The Protagonist, it doesn't all come together until the end.
And that's my biggest problem with this movie. It takes a long time to become invested in the characters, even for a Nolan film. Luckily, there's enough great action scenes to keep you engaged until you do. I think this may be because the information needed to make you care about the characters would also be giving away the ending. But I don't watch Nolan films for the characters. I want to see a unique idea played out in the biggest way possible, and this movie delivers on that.
I think the most impressive thing about this movie is that he created an intense story around the idea of reverse entropy. I know he's known primarily for his directing, but his screenwriting is top notch. All of his films are structured so well and this one especially so.
Maybe as great filmmakers get older and more experienced they want to make movies that are harder to pull off. They want to make something that challenges themselves and something that challenges the audience. This movie feels like that. It's not going to be for everyone, (even though it's marketed like it is) but I want more movies like this.