There's a rare gift Garth Ennis has - he can start a story with scabrous jokes, ultraviolence and similar blackly light-hearted fare, and then evolve it into something utterly heartrending, all without ever feeling like he's twisted the tone or made it inconsistent. He did it with Nick Fury, and The Boys, and he also does it here. The initial miniseries is set after the sun has burned the Earth's sea's away, on the deserts of the Atlantic seabed, and perhaps the Ezquerra art adds to this feeling, but it wouldn't be out of place in 2000AD; it's the same sort of comically bleak setting as Judge Dredd's world. But the tale grows bleaker in the telling, and by the end, you're slightly shellshocked.
And then, four years on, the sequel (also included here), Garden of Eden. Which is a bleak and brutal poem about the end of everything - humanity, faith, hope. It remains one of the bleakest apocalyptic tales I've ever read, and I've read a few. One for fans of The Road.