Costner as a merman, and Dennis Hopper in his lamest effort yet. As one would expect from the hype when it was released, the narrative/plot is crap, the characters undercooked, and the whole thing is within a hair's-breadth of failure. They should have spent more on the script (as they always should). Generic good guys, generic bad guys, generic pirate imagery, a find-the-promised-land, booty, Rambo-esque rescue effort, etc. that would shame the makers of Mario Bros. There are shades of Indiana Jones and sundry American myths here, as one always finds with Costner.
I guess it is easy to see how Costner's ego got the better of him after Dances with Wolves. His acting here is reprehensible. Rob reckoned the premise is interesting and epically fumbled. It is somewhat like watching the Wallabies play rugby.
This movie is mythical, like Star Wars, and is a mandatory watch even if it is a turkey. The cinematography is pretty good and I did like his boat.