Of course the series goes beyond the Ender Quartet now, but anyway.... ORSON SCOTT CARD RULES! (Almost as much as Eric Nylund. )
So, who's read at least Ender's Game? I'm re-reading Ender's Game because the last time I read it I was 12 and didn't understand any of it. Slowly over time I amassed five total Ender books, finishing my collection of the Quartet, and beginning Bean's series.
What I like about Card's books are that they're mature and provide a storyline. I notice that they tell the story behind the man (or boy in this case) without dwelling and having a page and a half of reflection on something or other. You don't have to be terribly bright to understand the meaning either. When it seems you are being kept in the dark, you are. However, the true meaning of something is always revealed later on.