Gosling makes a good bad guy - quiet, but scarily unpredictable. Dunst similarly is a convincing conflicted damsel in distress - you want her to do the right thing, but like real life, a combination of self-inflicted stupidity and refusal to see the writing on the wall forces her into one poor decision after another. The authenticity of the situation makes the movie interesting to watch, if not for the real-life intrigue element. That having been said, this movie will never crack anyone's top 10.
Movie to Skip: Bloody Mallory
The long and short of this one: kind of dumb, and pretty low quality. Pretty lame and skippable.