There was a Band of Brothers episode that dealt with the 101 encountering such a camp, the episode was titled "Why We Fight".
He and I watched that awful 60s flick, "The Battle of the Bulge", together. Afterwards, I asked what he thought. He said, "It was a fine movie." (it wasn't, but he'd not speak ill of such a thing) ...."but no one in it looked cold enough."
From then on, that's how I measure a war flick - by how cold, wet, tired, and generally miserable the actors in it look. BoB probably got it close to right. "Saving Private Ryan" likely did pretty well, too, and there are a few others.
But, if you watch war movies in general, I never cease to be amazed at how well-groomed and clean the characters look. Maybe they get a smudge of dirt or two on their faces, for effect, but that's all. :-)