Salman Rushdie. The most boring author ever?
Henry James. I need at least one full stop per page.
Hemingway. How much do we really want to know about shooting and fishing?
The Artemis Fowl author. Struggled through about four pages, and decided life was too short.
Tony Parsons. Does. Not. Give. Me. A. Lump. In. My. Throat (unless you count choking on all the sentimentality).
The Secret Life of a Slummy Mummy author. I was so fed up with the self-obsessed main character by page 2 that I gave the book (back) to the charity shop.
Will Self (though not sure whether it's him or his writing that's more annoying).