I have been a sometimes fan of the series. I have never seen 2,3, or4 and only half of 5. 6,7, and 8 as well as Hobbs and Shaw are in my back pocket. Frankly, there is nothing to say about this except it is stupid, but I enjoyed watching the stupidity.
The substitution of Jon Cena for Dwayne Johnson allows Vin Diesel to be the focus of the film, and that's fine. There are a couple dozen secondary characters that some people seem to like but all seem to me to be replaceable at any time. OK, maybe Tyrece Gibson as the main comic relief would be a little tough to replace, but otherwise, they are cardboard cutouts being moved around the set pieces.
Most of the film is made up of one outlandish chase, race, or fistfight punctuated with some flashbacks that explain most of what is happening. Don't worry about following that, just keep your eyes on the screen for the next impossible stunt, physics defying escape or miraculous moment of self awareness. This film goes full meta, acknowledging how silly it is and even nearly saying "we are a movie".
There is no sense in analyzing any of it, or critiquing the story. this series jumped the shark years ago, it's now just a question of what the next shark is. I may be in spoiler territory here, but don't worry, it was going to come out somewhere anyway, this is the "Moonraker" of the series. They make a bunch of corny jokes, and go to space. I'm only surprised that Roger Moore did not show up with his laser equipped Space Shuttle to help out.
F9 was the subject of this week's Lambcast, and we spent an hour just laughing at all the idiotic coincidences, resurrections, and tropes these films wallow in. I will post a link here when the podcast is live, I will credit Mark Hofmeyer, for coming up with my favorite title for a movie next time. "Fast Ten Your Seatbelts". That's better writing than anything in this pile of stuff that is instantly disposable, but fun while you are disposing of it.