Read the whole series.
Ultra-gory, ultra-blasphemous, pretty damn funny.
It takes a dip in quality after the 3rd volume, as a lot of the sense of fun is lost.
That certainly doesn't mean it gets bad. The first three volumes are just a BLAST though, particularly 1 and 3.
I like 'Hitman' more, but that's personal preference. I like everything Ennis has done that I've read, actually: Preacher, Punisher, Hitman, Hellblazer.
The one thing about Hitman and Preacher: Tommy (of Hitman) is exactly like Jesse Custer and Cassidy (of Preacher) mashed together.
Thanks, it sounds just like my kinda thing. I'll pick up the first volume tomorrow. I've been eyeing off some Hellblazer too.