I guess my opinion is that some of the war films about Vietnam are just entertainment and nothing else and some are educational as well as informative. Has your course chosen any particular films for you to watch? Some of the best regarded Vietnam films are Platoon, Born On The Fourth Of July, Apocolaypse Now and Full Metal Jacket. All portray a gritty and grim view of the conflict and even offer sosme political views. The first two I mentioned are by Oliver Stone and he is a Vietnam Veteran.
Good luck with the course.