It blew my mind. I wasn't expecting much and I got a plateful of fun. Great intro and amazing fight scenes. Even though the story is rather simple, it is extremely well told. I might not have liked the evil monster, but the other ones were great. Nice imagination there.
Brie Larson, Samuel L. Jackson, John C. Reilly and John Goodman.
Synopsis & information: http://www.imdb.com/title/tt3731562/