It's so weird you say this. I am about halfway through The Road. McCarthy's vocabulary is so fucking amazing and I love the way he writes. I read No Country for Old Men which I loved. The Cohen Brothers stuck very very close to the story, but it clears a few things up that the movie leaves vague. When I bought The Road, I also bought Blood Meridian, which is set in the 1850s about this kid who lives on the Texas-Mexico boarder where people trade Indian scalps. Sounds gruesome.
He has a trilogy out that is supposed to be amazing. I think All the Pretty Horses is the first book.
The guy is truly an amazing writer. Totally fixated on The Road. You are right though, it is fucking bleak. So much ash.