James Jay Edwards of FilmFracture wrote:
"Over four years in the making, "Jack the Giant Slayer" was directed by Bryan Singer (the "X-Men" franchise) from a script by Darren Lemke ("Shrek Forever After"), Christopher McQuarrie ("The Usual Suspects"), and Dan Studney ("Reefer Madness: The Movie Musical"). As can be gathered from the resumes of the writers, "Jack the Giant Slayer" is a strange mix of styles. Although not quite as brutal as "Hansel & Gretel: Witch Hunters", "Jack the Giant Slayer" is incredibly violent, with a flurry of people-eating giants and head-chopping heroes. However, it is still a fable, and the combination of the familiar story and the fun giants helps it appeal to children. With the ambiguity between storyline and visual content, it may be difficult for "Jack the Giant Slayer" to find an audience."