I haven't got round to reading the Ender's Game book, but after seeing this movie I definitely want to. This was a great sci-fi adventure that grabbed my attention with the brilliant trailers and poster. I chose this film over Thor: The Dark World, and while I may regret that, I'm still pleased with my choice.
I had a lot of fun with this film thanks to the incredible special effects, strong acting and convincing dialogue. The performances across the board where phenomenal, with Asa Butterfield again proving himself to be one of the best (and most underrated) teen actors around. Hailee Steinfeld (True Grit) and Abigail Breslin (Little Miss Sunshine) were also fantastic. The adult actors were possibly even better, with Harrison Ford giving one of his more subtle performances.
The special effects were truly some of the best I've seen in years, especially the battle scenes and simulations. I also really enjoyed the training scenes, as they reminded me of The Hunger Games meets Star Wars. The 'game' scenes were also very clever and inventive.
The dialogue was also great, as was the directing from Gavin Hood, who's made a huge comeback from the awful X-Men Origins: Wolverine. So, the reason I gave this film 4 stars and not 5 is because the ending, while tense and exciting, was a real let down for me, and I was not pleased with the 'twist'. It was just too anti-climactic for me, and my friends agreed. Overall, however, this was a fantastic sci-fi movie and one of the best this year (I haven't seen Elysium or Gravity yet). I recommend you see it in the cinema while you can to get the best experience.
Also, one thing that put me off the book was the author's comments on homosexuality. I've seen a lot of articles on the internet about how seeing this film shows your support in Scott-Card's beliefs, and while I can see why people would say this, I don't think you should miss the film because of it.