I didn't really realize that Charlize Theron was a big star.
I enjoyed the first half of the movie and they should have continued on with that, ending the movie with Hancock accepted and even loved by the 'people' but him still sad and lonely. The sequel if there was one, could have been the second half, just done better.
But it does seem they are trying to use the fact that its two movies in one, they marketed the first half for the box office run and now are marketing the second half for dvd sales.