Right up front, I'm going to stick a big fat "Will Recommends" on this. If you haven't seen it yet, go do so; don't read this review, and don't read any publicity materials. In fact no: make sure you have seen at least the first 2 original Evil Dead
Still here? You've hopefully already seen the film then, so this will be less of a review, and more my side of a discussion about why it was clever / great.
One more thing - did you watch the closing credits? All of them? If not; back you go... I'll wait.