I can't really speak for his books outside of Ender's Game, as it was the only book by him I ever read. I will say he writes for comic books fairly well, Ultimate Iron Man was quite original.
And back to the original subject, as bad as games are to his career, what he should be worrying about is we probably have a generation coming up that never read for fun. Those very same games that stop him from writing books also stop people from reading.
I work with a lot of teenagers, and I don't think I have heard any of them EVER talk about a new book they read in idle conversation. My own experience is I haven't read a book for fun since I bought my first computer for gaming back when Quake 1 came out. I do it a lot for school, but never of my own free will. Up until Quake 1 came out, I read about a book or 2 a week. Afterwards, I think I trailed off and just stopped in the late 90s. Anyone else have a similar experience?