The access to voices from the North and the Viet Cong, as well as South Vietnamese, makes it invaluable for understanding the conflict. Americans tend to reduce the war to simple "we could have won/it was unwinnable," ignoring the plain fact that IT WAS A CIVIL WAR. The lack of those voices at the time made us commit some egregious and serious blunders; without them now, understanding the war is simply impossible.
One salient example is the attack known as LZ X-Ray in the Ia Drang Valley
which was immortalized in the outstanding book We Were Soldiers Then... And Young
by journalist Joe Galloway (who was present) and General Hal Moore, who commanded two battalions of the 7th Air Cav. Both the book and the subsequent movie with Mel Gibson focus on the American soldiers fighting for their lives against what turned out to be a much-stronger force of VC and NVA regulars than intelligence had indicated.
But the show interviews several surviving soldiers from the other side who reveal how, despite horrific 7-1 casualties against, they learned how to fight against America's superior firepower by "getting so close you can grab the other guy by his belt buckle." Never mentioned in Galloway's book or the movie is how a few days later, the NVA wiped out a force of US troops at LZ Baker nearby when they got in too close for close air support or artillery support.
Without that information, the student of history thinks "it was an unwinable war because we didn't DO the "right" things. Actually, the war was lost because we didn't understand what we had gotten into, the country's tortuous history, its long hatred of foreign invaders, and the conflicting goals of its various factions.
While it's true that Americans were appalled at the carnage of the war as it ground on, we tend always to see things through the lens of our own experience. The war was much larger than simply North vs. South or Communists vs. non-Communists, with many elements that didn't even concern us, such as the Buddhist monks self-immolating over what were issues that had little to do with the conflict.