So I saw it. I wanted to give some thoughts:
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So I know the director has talked about filming the prequel scenes and de-aging Cruise and filming it like a Mission Impossible movie that would've been made in the 80s. And they decided, I believe, it was too distracting. But I think you're right - even if they didn't go all out, they probably still could've explained a bit more.
I think, overall, the movie is really good. I thought it was fun and engaging. But at the same time, I struggled with some things. I think the ending was a bit bizarre. The whole movie is set up as a culmination of 8 movies, and the movie goes out of its way to show clips from previous movies. This was a love note to fans of the franchise, but the movie doesn't really sell itself as a farewell to Ethan at all. The movie keeps talking about it as "one last mission" or whatever, but what's stopping Ethan from continuing the work? He doesn't talk about retiring, and he's not injured in any significant way. I thought for a few minutes that the movie would end with Ethan falling out of the plane to his death, sacrificing himself to kill the Entity. And that's almost exactly what happened.
But it didn't. And if, immediately after everyone walks way, someone calls Ethan and tells him that Benji has been kidnapped, Ethan would go right back to work. So what ended?
I also thought it was a bit crazy on two levels:
1. The movie says multiple times that "cyberspace" will end if they kill the Entity. Did that not happen because they captured the Entity? Or did it happen? The movie simply doesn't say. If there's somehow no Internet anymore, that's a giant change to the universe that the movie simply doesn't address
2. The movie ends with the Entity intact. Shouldn't someone smash that box? What's the point of capturing the Entity and holding it? That doesn't save the world, it just delays the inevitable. I figured Grace or Benji would smash it immediately, but then they just give it to Ethan? And he just holds on to it? I don't understand.
Then there's some other stuff that goes unaddressed. They talk about martial law across the world, but that doesn't really play into anything. Ethan and company are able to pretty freely cross borders and get through places and have chases without running into any problems. I also found Grace's character to be a bit frustrating. In Dead Reckoning, she was pretty clearly in it for herself, shifting a bit at the end. In Final Reckoning, she starts off seemingly in it for herself, but at some point she's all in. I don't know if that was earned.
I also think the dialogue was a bit clunky. They used the word reckoning way more than it's usually used in normal conversation, and I think some of the flashback stuff was very distracting. I have recently seen all eight movies, and I did some homework to remember some things. So maybe it was useful to people who haven't seen any of these movies since they came out. But to me it was distracting.
And I was also a bit blown away that the movie only had one big returning character. Where was Jeremy Renner or Michelle Monaghan or Sean Harris or Vanessa Kirby? I really expected that Renner would show up in a surprise appearance, and he certainly would've been helpful in this mission. And if they wanted to make this the final movie, I sorta expected some sort of "Endgame" sequences where people showed up to help. I know that Renner stepped away from the role and turned down something, and I don't know if there's animosity, but Renner almost took over this franchise. And for him not to be dead but also never be mentioned or even shown in flashback just feels super weird.
And the Jim Phelps Jr stuff....I didn't think that was earned at all, and I'd be interested in seeing whether or not this satisfies people who were turned off by Phelps being the bad guy in the original.
I know that was a lot of negative, but the negative just sort of stands out. I think the movie is really good. It might be one of my least favorite movies of the series, but this is a series of extremely strong movies. And this one, I think, bit off a bit more than it could chew. But, man, Cruise knows how to make a movie, even a movie this long, super fun and engaging. The action was fun and clear and didn't make my eyes gloss over. And the stunts he does at his age are so impressive and memorable.
All in all, I would love to see this series continue. And I think the way they actually ended it, this isn't really the end for Ethan, right? There's gonna be another one, I gotta think.