This was co-written and produced by Joss Whedon. If you're geeky enough to know the name, it's a good bet you've probably already seen this. But if not: it's a smart, frequently funny, takeoff on "this sort of movie". (Hereafter: TSOM.)
Because it starts out just like TSOM, except with tongue firmly in cheek: five young adults set out for a weekend of fun at the titular Cabin. And they are exactly the stereotypical group that winds up being terrorized, gore-spattered, and mostly killed in TSOM. Which is entirely the point.
In seemingly unrelated scenes, technical personnel are shown working in some underground lair on some mysterious project. The two main technicians are played Richard Jenkins and Bradley Whitford, and they're big enough stars to tell the attentive fan that they must be doing something importantly plot-relevant! But what is it, and how does it relate to our five protagonists?
Do you ever wonder why the characters in TSOM act so stupid just before they get done in? It turns out there are perfectly good explanations for that.
No spoilers here, but what the MPAA refers to as "strong bloody horror violence and gore" is soon to commence. If you're a bigger fan of TSOM than I, you will almost certainly love it more and get more of the in-jokes.
Favorite quote: "Good work, zombie arm!"