I'll watch this for free since Stallone is into gun confiscation.
That said, the star of Rambo 4 was the editor Sean Albertson. Stallone directed it but it was the shot to shot pacing once the action started that was unusually off the charts. He turned Stallone's footage into more than Stallone probably dreamed for. I watched it twice just to see how he did it. He also edited Rocky Balboa.