The technical achievemen really is not what made this film work for me (the coloring and other forms of digital manipulation fascinating but not that great). It worked because of its combination with the interview excerpts, creating a documentary experience of this war which is unconventional, vivid and immersive.
Essential viewing for those interested in (the history of) special effects, but nevertheless a rather straightforward documentary. The most poignant part comes near the end, where directors and sfx artists influenced by Harryhausen discuss (lament?) the current state of CGI, which through overkill is in danger of removing the “special” from special effects. To quote Harryhausen himself, “you can’t have an explosion every five minutes in Greek mythology”.