Gay marriage is legal in the US, and rightly so. Neither Orson Scott Card nor middle-eastern oil will change that.
Oh please. Ender's Game is a classic. The rest of his work is worse, and the recent Shadow stuff is execrable.
I also liked his A Planet Called Treason
The only criteria is:
They must be primarily known for sci-fi
They must be alive today
I'll start with:
* William Gibson * Ursula K. LeGuin * Charlie Stross * Margaret Atwood
Anyone else care to add to the list?
If it weren't for the "alive" requirement, I'd include Iain M. Banks. :-( Regardless, I highly recommend anything Banks has written over anything of Card's.
If we're willing to include fantasy...
* Brandon Sanderson * Patrick Rothfuss * George R. R. Martin * Terry Pratchett * Mira Grant * Jim Butcher
This just from a brief glance over my most-recent on Goodreads. There is lots and lots of good Sci-Fi and Fantasy out there, and I'd be willing to argue any of these authors over Card in terms of quality. (Though -- to be fair -- I was monumentally unimpressed with Card even before I knew his politics.)
A few of the authors on my list have politics I disagree with as well, but they at least are much less obnoxious and hateful about it.