Ender's Game

Ender's Game by Orson Scott Card was written in 1985 and according to the lists I've seen, is widely considered to be the #1 Science Fiction novel of All Time.  I liked it too; the writing style is so smooth that it reads like a dream...I am left with mixed emotions about it though; and have a bunch of questions: (spoiler alert...)

1. If Ender is such a brilliant strategist, wouldn't he have been able to anticipate the fight is the bathroom, and prepare better for it, or avoid the whole thing altogether?
2. Does he know he is being used by the military?  If so, does he care?
3. Does his victory against the buggers make him a hero?  Can one become a hero by accident?  If you are playing a video game and win, then someone informs you that the battles you were playing were real, and that the kills you scores in the game were real deaths, and you have just saved the world, are you a heroic figure?  Can you be a hero if you don't know the truth about your situation, the true stakes of the conflict and the real consequences of your actions?
4. Are you a hero just because someone with "authority" says you are?
5. Is a civilization that uses children to fight wars worth saving? 
6. There's a movie in the works; will Ender be the Sgt. York of our time?
7. If you are what you love, and Ender's Game is the #1 Science Fiction book of all time, what does this say about our society?

The good thing about Science Fiction books is that the good ones can give you things to think about, and  Ender's Game certainly does that...