Hmm, debates like this always bring to mind wether or not the naysayers have actually picked up a book and read it through, rather than relying on word-of-mouth, late-night sci-fi movie specials or the high-browed chic of denouncing what is popular.
King is original, and has managed to combine three worlds: science fiction, horror, and the supernatural. The last person to do it was H.P. Lovecraft, and the last to do it
well was Algernon Blackwood. King has always had inventive, original ideas, and though I do admit his style is sometimes simplistic, I have never read an author who was able to evoke as intense emotion in the reader as he, or stir the thrill to read in people who would otherwise bask in a culturally stagnant society.
Other than J.K. Rowling, but that's a different debate.
The title of 'fiction-mill' should be reserved for 'woman-dectective/lawyer-stalked-by-a-serial-killer-she's-investigating' books or dime-store romance novels set in the 18th-19th century with no respect for the culture or prose of the era. King is the author that impressed upon me the love of reading and the love of writing, and I will always defend his work.