I think McCarthy is one of the greatest American writers, but I will say my two main gripes with him are his tendency to drift over the line into overwrought (sometimes the biblical language is incredibly powerful, sometimes not), and his utter inability to write women.
He did ok with Alicia in his last couple books, but even there he flounders some. "If I had a baby I wouldn't care about reality"? Hmm, ok?
"His face was all covered in girljuice"? C'mon bud.
But no writer is flawless.