I liked it more than you, but even so: it's a slight story that relies on people chewing the scenery to make it fun. In spite of Johnson's purported interest in characterization, I find that his work doesn't actually WORK for character-building in ways that speak to me.

Also, this story depended a lot on a slight twist to the traditional mystery narrative. If they do make a sequel, it will be hard to find something that can carry that weight. (Especially since the sequel is supposed to center around Daniel Craig's detective, and his Kentucky-fried-accent was just meh for me.)