Im interested in constantine both as a fan of supernatural and theologically based films and well I also read the Hellblazer comic it's based on (since Im a geek)
The movie looks like a lot of fun, a nice mix of chills with cynical black comedy and a visit to the nether realms of hades.
Keanu really can be good when he wants to... I highly recomend "the gift" (directed by Sam Raimi) where he plays a very convincing wife beater, kinda the oposite of is usual "cool" character. The movie also contains Katie Holmes as a "cold seductress" and a lot of other great actors playing the oposite of what they normally play on screen.