Cutthroat Island has a race for buried treasure, truly spectacular stunts, and pirate Geena Davis stylishly swinging her sword. So why was it such a colossal flop? Simple: The producers sank $92 million into an out-of-vogue genre no one wanted to see. Yet the lower expectations (and higher trash tolerance) we bring to video viewing make this a relatively low-risk rental. On the big screen it may have been an exhaustingly frantic, deafeningly Dolbyized critics’ ordeal, but downsized on tape — and letterboxed to boot — it’s a comfortably overstuffed action title, certainly worth three bucks.