Kingdom of Heaven was terrible in terms of historical accuracy (Ottoman renaissance armoury, saber wielding Saracens...), as was Gladiator and Robin Hood (Cate Blanchett is wearing a Sallet!)
@representation of Rome in Gladiator: Too clean and white. HBO's Rome is more accurate, painted temples, mud and graffitti.

Thing thats sucks about 90% of historical war movies is the unrealistic representation of armour. Yeah they spent a fortune to wear heavy armour that gets piercing by everything like its made of paper...


My list of accurate Films:
Flesh+Blood (About Landsknechts)
Alatriste (Most accurate depiction of warfare, weaponry, armour and clothing of such an early time since Cromwell)
Cromwell
Master and Commander (Unbelievable, an expansive hollywood movie thats accurate even in tiny details!)
Barry Lyndon