Incorrect, IMO. Sci Fi is, or was, for most of its existence about ideas taking precedence over literary skill and writing style. One only has to read the horrible prose that was characteristic of the entire genre until the 60ties and 70ties, and even then it didn't get much better.
A point that can often be brought up is the much vaunted Asimov. Granted the man had good ideas, but he couldn't write for ****!
@entrerix: I can only tell you that Martin is a soap opera with swords and more sex than usual.
I also liked Zelazny's writing style, and I'm lead to believe that Ursula Le Guin is good as well, although I can't find the books I want to read in these parts, and my interest in the anarchistic ideas she advocates in her better books has diminished.