High Adventure!
My time was right around 10 hours, with only 35% of the achievements. Filling all these out, finding rare treasures, using particular weapons, all make the game's reply value high.
Speaking of guns, combat is probably the low point in the game (at least for me). Combat is third person that uses a cover system. The cover system is okay, but sometimes I found myself getting stuck behind cover instead of moving as I meant to after coming out, or into, cover. For the first 3/4 of the game, the combat is completely repetitive, pirates, pirates, and more pirates. Afterward, combat get's more interesting, and will actually up the suspense 10-fold.
The game is short, but not overly so, due to the reply value and fact that now, the game can be found for 29.99. At that price, this gorgeous looking game is worth it for anyone with 10 hours to spare.