I just rented this movie yesterday, despite mixed reviews.
Many reviewers compared the movie to Charles Bronson's "Death Wish" movies, which is true only to the extent that Harry Brown (played by Michael Caine) kills for revenge.
After the first watching, I thought it moved too slowly. On watching it a second time, I felt the quietness of the movie (with the interruptions of violence) built upon Caine's character. Without Michael Caine's acting, the movie would likely be worthless. With his acting, it's a very well-done revenge genre film.
Has anyone else seen it?