This series really messes with my mind. Ender's Game, the first time I read it, made me (1) wish the battle room were real, and (2) be completely wary of why people were saying what they said and doing what they did. All three of these books are about hyper-intelligent children (Bean even more so; his secret is revealed in Ender's Shadow), who can figure out the whole from the part, tell when people are lying, and generally divine the non-squishy motives behind the squishy things people do. Like saying hi. People say hi gruffly in these books because they want you to think they aren't nice so you'll do what they say, or cry so that people will think they're upset and move them to some place with windows where they can escape better. They know too much about psychology for psychological tests to find out anything about them besides what they wanted the tester to know. Nothing is reasonless. The adults are always watching, because they are children and because they are child prodigies. There is no pause to wonder what this is all about, what it is for: only the next goal to achieve. The next person to get on their side, the use of this person as a tactic to enforce their strategy. I guess that's good writing, because they are military commanders after all, that's how commanders have to think - but adult military commanders are not as focused. They got to be people first. The kids are only just learning to ... squish. To actually tell people how they feel - if they find anyone they can trust enough. To be human, be like the people in the world they saved.
And that screws up my mind. Um, but they're really good books.