I was initially disappointed after viewing it, but it's because I was expecting horror (I know, I know, I should've known better since I watch everything Whedon has a hand in, but I really didn't know this time). The trailer is misleading. Some people may enjoy the dumb trailer, but I think the trailer is extremely important to how a person initially perceives a film.
Anyway, once the movie finished, I re-adjusted my thoughts. The more I think about the details in the film, the more I realize it's extremely clever. Part of the issue is that I only watch horror films once in a while. I don't have a problem with them, but I also don't actively seek out these films to watch. And I'm surprised so many people like CITW with all the classic Joss Whedon and Drew Goddard elements in it. I mean, I love all that stuff, but they have a hard time getting the green light in the industry. I think I've seen every one of the concepts present in CITW in their (Whedon and Goddard's) TV writing. This is a good thing, for sure.
The unicorn stabbing was awesome. The Japanese kids scene was hilarious. Title card was great. Even if you're not a horror fan, it's worth watching for the humour.
Really awesome to see Whedon alums in the cast too.