At first, the somewhat serious tone of the film and Hancock's struggle with other people's hatred, well depicted by Smith's performance, pulls us in. It's a refreshing, interesting concept. However, it grows increasingly hammy as the narrative unfolds and illogical and choppy plot devices are thrown in, somewhat thwarting the emotional connection with the protagonist, culminating in a feeble conclusion to the story.
At the time it was interesting to have a superhero like that, that was in no way a role model. A bad guy, well, not even a bad guy, just not a hero, with high moral standards. But someone who happened to have super powers. And to have him do an image make over, like a polititian, or a rock star would do. That is interesting. It was precursor of superhero movies that would come out later, like Super, 2010.