Science fiction? I'll take speculative fiction, thanks.
I am a huge fan of old-school cyberpunk - Neal Stephenson, William Gibson, Rudy Rucker, Masamune Shirow. Big fan of Katsuhiro Otomo's old work, as well - Akira, Domu and Fireball. Also, let's not forget the old-school writers: Frank Herbert, Asimov, Heinlein, Arthur C. Clarke.
As for politics, I'm closer to Ursula K. LeGuin's politics than Orson Scott Card's (or Heinlein's, since his libertarianism is always bandied about so much).
As for the very old-hat and stereotypical idea that most sci fi isn't "literature," whatever that means, because it's not centrally about the emotional lives of characters, that is (a) only sometimes true and (b) all a matter of what you're looking to get out of a book. Just as I don't watch a David Lynch movie hoping for a tight, compelling and fast-moving plot, I don't read hard sci-fi hoping for deep and penetrating psychological narrative. The same people who criticize the reader for being unable to wade through a "high literature" aristocratic slushfest like Anna Karenina will then turn around and criticize the writer if the work they find unappealing is from a "lowbrow" genre.
This is kind of like how many literary critics dismiss the entire medium of comics offhand, but show themselves to be both unschooled in the unique storytelling language of the medium and ignorant of its great authors, movements, styles etc. when they talk on the subject. Even those of them who have now embraced the "graphic novel" idea are not much better: they see the endless hyperbole about Maus (and more recently, Persepolis and the works of Chris Ware) and think that these are somehow special exceptions, works that have "risen above" the "constraints" of the medium. It would be nice if they knew the first thing about it. Art Spiegelman was not the first person in the history of artistkind to tell an effective, deadly serious, and heartwrenching story in the medium of comics.