Lack of good storyline.
This is one of the few movies I've ever seen where the whole audience broke into spontaneous, loud applause a third of the way in.
All of these films share one commonality, that being a kind of emotional center that humanizes a cast of monsters.
I didn’t really have many expectations going into the movie (good or bad), but I actually really enjoyed it. I really liked the characters and the banter between them.