Let's be real, the story is ripped off from Ender's Game, and pretty blatantly at that. The dialogue is not fantastic and though it does start with a double homicide, even the latter books aren't all that mature. It also has characters with the Decision making skills of the fools in The Crucible.
Don't get me wrong, I thoroughly enjoyed these books, but I read them as they came out(retread with every installment, so yes I've read SS seven times). She has an amazing world built in her head, and that cannot be taken way from her.
The Time Turner in Prisoner is my prime example of poor writing(and decision making on J.K's part).
Not that Orson created the idea himself, but lol.