It seems the word genius is easily lain as moniker upon the man to whom this site is a worthy memorial. Was/is Bukowski my favorite writer? Yes. Unlike most writers, was he equally adept at the poem, short story and novel? Yes (an arguable point, as some of the short stories fall just a bit short of his other works). Could he write dialogue that puts you in the scene unlike most other's contrived dialogue? YES.
Does he appeal to most people? No. Does he write about intellectual topics, a trait that is commonly associated with genius? Most say no, those of us who get it see the intellectual simplicity of his message.
My former mentions of his greatness as a writer do not make him a genius, and my latter mentions of some of the controversy surrounding his writing and subject matter do not preclude his being a genius. I can only think of two other writers who approach Buk's ability as a writer, and they are stylistically very different from him: Albert Camus and Fyodor Dostoyevsky. You guys may see the similarity in terms of ability, whereas most other do not, and, would probably ridicule me for saying it.
Was he a genius? I have no idea what that even means when applied to a writer. What was his IQ? That's how we define genius. Who fucking cares? He got it; he wrote about it. He did it better than anyone else.