I saw the whole thing through.
I'd give it 6/10
. "More twists than a bag of pretzels" is how I described it over on the Light Side. They tried to get way too cute with the plot twists and the double-crosses, and even though I caught them all (and had to explain half of them to my wife, who was having trouble understanding some of the speech), I thought they were mostly unnecessary.
Slight Spoilers Follow!!
It was OK. It wasn't terrible, but the only thing to see in the last 20 minutes is the special effects work from the fighting ships. But even then you get cheated - I was hoping you'd see this huge armada naval action, but instead it's just two ships mano-a-mano. While cool, it's not remotely realistic that a giant armada of ships-of-the-line would just up and sail off when they have a collection of "the scourge of the seas" under their guns. Whatever the explanation, that was just unbelieveable.