It's hard to see an author so defensive about their work. There will always be naysayers. Ender's game has persisted for so long in a way that so many of it's peers hasn't.

We have to remember that negative experiences effect our users more, and complaints will in general outnumber the praise, even if the the number of users who are unhappy are outnumbered by happy users by orders of magnitude.

Alternatively, haters gonna hate.