Some actors may find it easy to assume a striking pose, but then they find it hard to move around. As he's shown us before, DiCaprio can put on a mask and vary it from scene to scene. From moment to moment he can make those flickers of the eye, those changes in expression, in the angle of the head that keep us cued in to the flow of meaning. He's a pleasure to watch. John Hodge, who wrote the screenplay based on Alex Garland's impressive first novel, has talent.
Scenes make their point without needing to be underlined.
Later scenes are nicely intensified by foreshadowing in earlier ones. The script flows along. The message seems too easily summarized and there doesn't seem to be any bone and sinew that makes it happen. Each shot is stunning, tweaked absolutely to the max. Each shot is as unpredictable, on arrival, as possible.