Perfection
I honestly don't think that an argument can be made in favor of this movie without writing an entire fucking essay on it against those who think it's just boring, self-indulgent, and pretentious. I will not waste energy defending the movie from people who think that way
It's very long, obviously. It has a cast that is so star-studded that it works against it because it's distracting seeing superstar actors like John Travolta, Woody Harrelson, John C. Reilly, Jared Leto, George Clooney, etc. (not including Thomas Jane, Donal Logue, Nick Stahl, Tim Blake Nelson and more if you really know your actors) just popping up , barely doing anything, and then disappearing. Nick Nolte, Sean Penn, John Cusack, Adrien Brody, Elias Koteas, Jim Caviezel, and a couple of others get the biggest roles so they aren't as "distracting", but when you add them to all of the other names previously mentioned you get what is quite possibly the single most impressive film cast of all time
Beyond all of that it's more than just a war movie. It's basically a war novel and an experimental film if you consider Terrence Malick's motifs to be experimental (which I do)
War movies should not be life affirming. They should not be about the glory of courage or heroism or self-sacrifice. They should make you feel bad. They should leave you feeling sick in your stomach and confused. If they don't do that then you are watching a video game stream of a Call of Duty match. You're watching Tropic Thunder unironically. You're watching shit like Saving Private Ryan and thinking that it's a great movie