From all movies about antiquity I like "Alexander" the most. It is not accurate, but it has at least some accuracy in it.

May I ask a question about "King Arthur"? Is it the movie about the Sarmatian riders who formed the Roman cavalry? If then I would like to know what was accurate and well searched in this movie? I watched it with less than possible interest after I get told that the Romans were still in Britain in the middle of the 5th c. AD and that the pope was the leader of the Roman empire...

"All Quiet on the Western Front" is fictitious but is quite accurate about the Trench War experience of individuals. The book after the movie is made ("Im Westen nichts Neues" by E.M. Remarque, 1928/29) is one of several well made novels about WWI. Because it was not so much patriotic it was forbidden and burned by the Nazis after 1933. Remarque had joined the war only for a short time, but he took much information from the reports of other soldiers.