For parents to consider
Constantine is appropriately rated R for extreme violence, gore, and obscenities. Unlike the Harry Potter stories, in which magical spells are the sort found in fairy-tale make-believe, Constantine fictionalizes the dangerous realities of spiritual warfare in a way that entertains us with sensationalized evil. This is the kind of film that really could provoke immature viewers to develop an unhealthy interest in the occult.
Me? I liked it. Especially Gabriel.