Mnaaaah... Ok it looks impressive (visually...). But it's way more anout fantasy, fiction and matrix-esque style than about real history. Not my taste...
Yeah its based on the graphic novel. Its fantasy based on a historical battle,but it looks very good.
"300, of course, makes plenty of allowance for popular tastes, changing and expanding the story to meet the protocols of the comic book genre. The film was not shot on location outdoors, but in a studio using the so-called “digital backlot” technique of sometimes placing the actors against blue screens. The resulting realism is not that of the sun-soaked cliffs above the blue Aegean — Thermopylae remains spectacularly beautiful today — but of the eerie etchings of the comic book.
The Spartans fight bare-chested without armor, in the “heroic nude” manner that ancient Greek vase-painters portrayed Greek hoplites, their muscles bulging as if they were contemporary comic book action heroes. Again, following the Miller comic, artistic license is made with the original story — the traitor Ephialtes is as deformed in body as he is in character; King Xerxes is not bearded and perched on a distant throne, but bald, huge, perhaps sexually ambiguous, and often right on the battlefield. The Persians bring with them exotic beasts like a rhinoceros and elephant, and the leader of the Immortals fights Leonidas in a duel (which the Greeks knew as monomachia). Shields are metal rather than wood with bronze veneers, and swords sometimes look futuristic rather than ancient.
Again, purists must remember that 300 seeks to bring a comic book, not Herodotus, to the screen."