I think you may be looking more at the hype than at McCarthy's work (and he certainly hasn't been "hyped" his entire career). Have you read any of his early books? If you're a fan of Faulkner, I don't see how you couldn't enjoy those. So, he's finally getting some recognition. He's an old man, for God's sake. Would you begrudge the guy a final victory lap? And he's hardly resting on his laurels like other older writers. The Road is one of his best books.
I've read Tim O'Brien's The Things They Carried. Great book.
Vollman I've put off for various reasons. First, it seems like all his books are 2,000 pages long (did you read the multi-vol. Rising Up and Rising Down or the condensed version?). Second, I've only read one story by him about his time with prostitutes in the Far East. Frankly, the guy struck me as a bit of a John Mark Karr-like creep. I'll give him a try on your endorsement (probably Europe Central or the condensed Rising Up and Rising Down).