An all-is-not-as-it-seems adventure.
... and a moral choice.
... and an emotional drama sub-plot
... and lots of hints
Overall, a great thinking man's adventure and a chance to be a Big Damn Hero.
I like it, but a more shoot them up group might find it a little slow ... although a group making all-the-wrong-moves could find enough action to turn anyone pale (nothing like going to war with the marines to get your blood flowing).