I think any promotional campaign for Ender's Game that fails to use "The enemy's gate is down" as its tagline kind of just… thoroughly discredits itself.

But it's way easier to judge the film itself by looking at this trailer, especially when you know the book. The book is quite dark and mature and it deals for most of the time with Ender's psyche and his relations with everyone on board – from military officers, to other kids – friends and enemies alike. Oh, and there are simulations. Looks like the movie is all about simulations and Really Tired Harrisson Ford, with some heavy CGI sequences and little on characters.

The last and the most important thing I'm concerned with it's ending. No spoilers here, I just think that you need a good director, with a vision, with the eye for details, not so much focused on CGI and preety-looking set and pieces, but on characters and psychical pressure they're put through. Gavin Hood is not one of those directors, so the "twist ending" not only will be forced and – probably – not surprising, but most of all – without the emotional resonance of original material. Which is sad, because this story has a HUGE potential in the right hands. But looks like there's no right hands in Holly for now..