In this film Downy Jr plays an arms manufacturer who has a change of heart after he is kidnapped by Afghan rebels during a weapons test. He escapes when he builds an iron suit (the rebels tell him to build a weapon) and sets off trying to get back at the rebels (and change the emphasis of his firm) when he gets home.
It's not a deep and meaningful but it's a pretty decent way to spend a couple of hours I think. It's surprisingly violent, so be warned, but I think you'll like it all the same.