The characters, mostly Jeff, but also Miranda and the supporting cast, are far stronger than your average horror flick. Jeff is a genuinely nice guy and the audience can't help but root for him. The characters' actions generally make sense, and the ending does help explain actions that otherwise are a bit off.
As for the plot, this is basically a re-imagining of the Wicker Man, so if you've seen that, you should see where this is going. If not, this movie might surprise you. Hard to find, this movie may be, but it's worth a watch.