At first, I've dismissed the recommendation by Netflix to watch this movie. I've had my share of disappointment with algorithms and documentaries. What changed my mind is the fact that the making of The Long Road to War was almost a one-man-show.
In terms of delivery, The Long Road to War had some similarities with the works of Adam Curtis, my favorite author in the genre for almost two decades. Archive footage and interviews with the experts on the subject matter were expertly mixed.
In terms of content, it was neither provocative nor burdened by conspiracy theories. It is a well known fact that the superpowers of the era eagerly went to war, not only the leaders and the elites but also those who were to die in the conflict.
And if you believe the assassination of the Archduke Franz Ferdinand in Sarajevo was the cause of the First World War, than I doubt the quality of the history class you've attended. It might have been the reason at best. The causes are well described in this documentary.
In terms of iMDb start The Long Road to War is on the top of the scale.