If you want action, Blood, Guts and assorted Gore, by all means watch Constantine. The series is based on the comic book, Hellblazer and if you have been watching, it is one CRAZY ride. The main character is played by Welsh actor Matt Ryan, and even though he has a rough exterior, somehow he appears loveable. Go figure. (He is one good-looking bad-boy!) I love this show, it packs a wallop, and has the feel of a movie.
Zand's Wacky World 
I loved the movie Constantine starring keanu reeves. Is the series better than that.
I like Keanu, but Matt Ryan gives the character a much harder edge. I would have to say the series is much better, and the plot lines are fascinating. They have me hooked !