While considering going to the movie I was thinking if the one-shot thing deserves that fuss. And I was shocked with how it's not just a technical show-off, but it truly serves the point of the movie.
It makes you live the whole journey from the very beginning without missing a glimpse. You can feel the war around you.
In addition to technicalities, it's written in a tense, emotional, touching way with super soundtracks that gave me an heartache with its final chapter.
Sam Mendes nailed the war category properly.