***SPOILERZ***
Ok, most of my fears about this film (and complaining in the trailers thread were realized)
I'm a BIG fan of the book, so that needs to be mentioned here.
1. First off, Lily Gladstone will win Best Actress, and she should. Not since Julianne Moore in Still Alice has someone done so much acting with just their eyes. She steals every scene she's in.
2. DiCaprio was fantastic as the weasel of a husband. The scenes with him and Gladstone are the best in the film.
3. As others have said before me, this movie was at least an hour too long. The movie never grabs the viewer enough to justify its runtime. Too many scenes just go on and on with no added value. Oddly, the film spends too little time on important aspects of the murders and dedicates tons of time to superfluous stuff. EDIT: In my opinion, the first 15 minutes were the best in the film, thanks to the fantastic score going on.
4. I was worried about the casting of Robert De Niro as Hale, and that fear was justified. He basically plays Robert De Niro in three-piece suits giving side eyes. At no point is his character anything other than a warm body. The drastic age difference between the real Hale and De Niro was also annoying.
5. My biggest worry about the trailers, and one I complained about ad nauseam in that thread, was the narrative structure. The book is a mystery being solved by the FBI. The movie gives away what's happening 10 minutes into the film (as did the trailer) and loses any suspense or emotional investment after that. In order to change the narrative, the main character was switched from Tom White in the book to Ernest and Molly, who are major supporting characters in the book. By doing this (especially with Ernest), there's no mystery or suspense. We're watching a 3.5-hour press release to which we already have all the information.
6. Also, Jesse Plemons does more with less than any actor around.
7. Brendan Fraser's role was like if the script said, "Man screams loudly."
8. The end of the film, using a radio show to tell what happened after, is awful. It makes zero sense and pulled me right out of the story.
9. Scorsese dedicates a ton of time to the Osage, and rightfully so. But they're all caricatures. By eliminating nearly all of the investigative side of the story (of which there's a ton), you don't really learn about any of the Osage victims, thus you never get invested in solving their murders (and you don't get much investigation at all, really). You don't get Tom White's fight for justice, Hoover's insistence on solving the case, or Mollie's confusion as to what's happening.
I'm sure I'll add more to this in the coming days, but I was very disappointed in this one.