John Laird’s review published on Letterboxd :
Normally, you can disregard anything that's been shelved by a studio for multiple years. This, however, is an absolute gem. It takes the horror genre, turns it upside down, pays tribute to it, slaps it around, and then douses it with a huge dose of humor. If you can't find a way to like this, then you're probably just not a big enough nerd. Also, the least you know about this the better, so don't watch any trailers!
PS - With this and The Avengers, Joss Whedon is one step closer to being loved by nerds everywhere. Forever.