Book to Movie Dilemma

I read some news this morning that has left me befuddled. The brilliant book, 'Ender's Game' by Orson Scott Card, has been made into a movie. On the face of it, I should be excited. I loved the book which, despite the extreme violence, actually had surprising depth.
The plot is that Earth has been at war with an alien race for seventy years and, in a desperate attempt to gain the upper hand, a radical new approach is adopted, where the world's most talented children are whisked away to a military training school where they learn warcraft in a zero gravity 'game'. I shan't say any more, for fear of spoiling it for anyone who hasn't read it, but the resulting story is every bit as emotionally challenging as it is violent. It was a fabulous book, and the news of the movie has tempted me to rummage through our crowded bookshelves for our well thumbed copy.
But for all that, I have reservations. I worry the movie will weigh in too heavily with the violence, the awesome battles, the gungho manly type stuff, ignoring the psychological and ethical questions raised by Orson Scott Card's original work. The trailer is impressive, as is the cast list, and I'm so very keen to watch it, but many a good book has been ruined by a crudely interpreted movie. I really hope it won't be the case with this one.