According to ESRB, this game contains: Blood and Gore, Intense Violence, Language
Parents will want to steer their children clear of this one. There's nothing blasphemous here, but it's very, very violent, and contains depictions of hell filled with tortured, burning souls—definitely not kid-friendly.
Fans of the comic won't be too interested, as it's about John Constantine in name only, and despite a few sideways references to the book, and a cover gallery in the bonus sections, there's nothing here for fans of sophisticated British horror.
Fans of the movie might be interested however, as it actually has a slightly better story than the movie did.
Deaf and Hard of Hearing gamers should have no real trouble with the game. There are no vital audio cues, and everything is subtitled, so feel free to go demon-hunting.