I read science fiction almost exclusively. My favorite author is by far Isaac Asimov. I own about 10% of his books, and I've read every science fiction novel he's written and published. (Still working on getting every short story.. then onto the grand task of all his other stuff.)
Other authors whom I respect: David Eddings, Roger Zelazny, Edgar Rice Burroughs, Frank Herbert, Ursula K Le Guin, Douglas Adams, Ayn Rand (I'm willing to argue if you don't think <i>Atlas Shrugged</i> isn't Science Fiction).. And there's many others. I take great pride in what I read, and it gives me great pain to see the number of readers every year diminish. I don't respect people who don't read.