I think the "well-fed" thing has been overblowm. Yeah, they were. So were the soldiers in almost all war movies. It's not like anybody was fat or anything.
More problematic, IMO, was that so many of the soldiers looked the same. Since the point of the film was not character development but immersive action, having the few characters that we got to know a bit to look more distinct, physically, would have been nice for the audience to make certain they knew who was doing what. Especially with the multiple time-line thing in play.