The History Channel did a "History vs Hollywood" show on it last night
In addition to the normal historians, they had 8 survivors of that battle who'd seen the film and offered their opinions. In general, the vets rated the movie at about 75% history and 25% Hollywood. Many of the characters were condensed so that events that happened to several people are portrayed as happening to a single individual. The scene about where the trapped platoon wasn't considered very accurate at all. However, all of them had very high opinions of their commander (Mel Gibson's character) and the movie was considered quite accurate, until perhaps the last 20 minutes. Sounds like a good one to me.