Pretty darn good in Ender's Game
Pretty much the best thing about that flick. There's real conviction in his performance. It sticks with you, and I think he even manages to outshine pros like Harrison Ford, Viola Davis, and Ben Kingsley. He has a bright future ahead of him.
Particular favorite scene of his which I think he kills it in is the scene when he navigates the crew while fighting the entire alien world. Quite a climax.