Saw this last night, having never read the comic book nor having any knowledge of the actual history of Sparta or this specific battle. It was entertaining...better than I thought it would be, but also somewhat predictable and overall forgettable. Throughout the movie, I kept thinking that this looked and felt like a lite Gladiator wannabee...even down to the little details, like the mother/son scenes in the wheat fields, the strong female lead (her speech, her strength, even her look were Gladiator-esque), etc.
Worth seeing on a big screen if nothing else at the theater looks particularly compelling to you...