Starting filming without having a script was a classic knock Siskel and Ebert would give to a film. So it's amazing that that's considered standard modus operandi over on the Mission: Impossible set.
I'm a huge fan of M:I Rogue Nation. The other ones are good, but that one was on another level. It reminded me a lot of Hitchcock's classic North by Northwest. The stunts were cool, but by the end of the movie, it's not about how hard the characters are punching each other, but about how they're outsmarting each other in a cat and mouse game of wits. The writing is ingenious. And Rebecca Ferguson was one of those true discoveries, the only female in the series that really owned the screen. Their equivalent to Marion Ravenwood or Princess Leia. I was disappointed in Fallout that the ending resorted to the old digital timer countdown on a bomb, and that it lacked the lighter comedic touches of Rogue Nation. Rogue Nation is a movie buff's movie, I think, in that you can tell it knows it's a movie and is just there to play, not to be taken overly seriously as if it's a real world matter of life and death.