This take is baffling... in SPR the protagonists lose man after man over the course of the movie, right up until the end. A central theme is the irony and tragedy of how the mission to rescue a single man costs so many lives.
BoB was somewhat like that too. They lost "brothers" along the way. While there are heroic deeds along the way, it shows the sad realities of war as well.
> The point I am trying to make is that the opening is the 'low point' and then it becomes an action movie with the heroes in control.
To be quite candid, I did not appreciate the brutality of WW2 until I spent a few months a decade ago researching the progression of events from 1939 to 1945. I say this as someone who had a fairly decent exposure to WW2 (Gramps was a B29 bomber pilot). Even now, every time I do a little digging or reading about a certain WW2 event/battle/massacre, I am still left shocked by the absolute brutality that occurred on a large scale. Conflicts since WW2 have not approached the same level of killing intensity, thank god. Perhaps nuclear weapons are indeed proving to be the ultimate moderator of human conquest ambition.
Sorry for rambling a bit: Back to your quote about it being a hero action movie - in my opinion WW2 kinda was an action movie with many stories of heros who sacrificed themselves or risked their lives directly to save their buddies - on all sides. The reason we hear so many of these stories from that time period is due to the massive number of engagements and opportunities presented near daily for men to attempt extraordinary maneuvers (e.g. flank attacking an overwhelming force who has their squad pinned down).
Some of the stories you hear from WW2 are absolutely over the top insane (risky). You will never hear nearly as many "hero" stories these days in my opinion due to all professional militaries employing similar risk-mitigation strategies to avoid unnecessary losses. Times were different back then.
The point I am trying to make is that the opening is the 'low point' and then it becomes an action movie with the heroes in control.