The British actor heads up the new sci-fi Western, which has already earned more than $92 million (£57.5 million) at the box office since its release last month (Jul11).
Despite the rise in 3D films hitting cinemas in recent years, director Jon Favreau decided against using the technique - and Craig is sure it's benefited the blockbuster.
He tells BBC's Newsbeat, ""It was a very deliberate decision and I'm glad we didn't (use 3D). We'd still be shooting it apart from anything else. Classic westerns are 2D... so you can stretch the image right across the screen and it looks like it should do.
""I think 3D works in animation and it gives me a headache to tell you the truth, I'm not a big fan of it. Maybe I'm a bit old-fashioned.
""When you watch a 3D live action movie you're forced to look at parts of the screen which you might not necessarily want to look at, but you have to because that's where the focus is. With 2D you get a much richer feeling and can look where you want basically. The whole thing with wearing the glasses is a bit silly.""