That's about as best as I can describe the plot, even though the entire latter half of the movie has nothing to do with that. In fact, the second half of the movie is more of the consequences of what occurred in the first half... sort of. As I alluded to at the beginning of the review, I enjoyed the second half of the movie much more than the first half. The first half just lacked substance, meat, or heart, if you will. It just zipped through the plot like the movie version of Harry Potter and the Goblet of Fire shot through the first 200 pages of the book in 15 minutes. That's the best way I can describe it.
But I can't say, specifically, what I liked about the movie, because that gets into spoiler territory. So all I can really say is my favorite part of the movie all occurred in the second half (though it was alluded to a few times in the first half) and dealt with the superhero lore. I thought that was really creative/imaginative, and I really wished they had dealt more time of the movie on that, as well as the connection between two specific characters. Hopefully if the movie does well enough to garner a sequel, the sequel will do it there.
However, on a similar subject, the movie set itself up for the perfect villain, but then decided not to go that route. Instead, we get really surface-level, shallow villains with no real substance or... anything. They're just boring and non-special in every way.
The last real thing to complain about would be whoever the heck controlled the camera (or the director, if it was all his idea, which it most likely was). I'm rarely ever conscious of camera choices, but I could never get comfortable in the movie because of it. It liked to get right up in every character's face in a tight close up (usually used to give everybody a feel of claustrophobia), even if everybody was in a wide-open space. And there was an incredible preference for the zoom button and shaky-cam; as in, the camera would be shaking about like a Bourne movie, and then the cameraman would hit the zoom button so to, very noticeably, shoot in even more on an actor's face. I noticed it moreso in the first half of the movie than the second half, though. However, I loved the editing work for the climax of the movie, juxtaposing what was going on between Hancock and a certain other character. I thought that was brilliant.
Now on to some good stuff. As for the acting, it was done nicely all around the board. I can't say much more about it, really. The villains could have been better, as I stated, but I think that was more of a scripting issue than an acting issue (...at least for the most part). The visual effects were stunning, specifically in the second half of the movie with stormy weather fight and the climax battle. The movie was relatively funny, as I did laugh quite a few times. Though I did come off rather negatively in this review, I did enjoy it quite a bit. It was entertaining enough, though it could have been so much better with the potential it had. And they should have concentrated more on the superhero lore. In other words, I think the movie could have been helped by a longer time frame; perhaps another 30 minutes or more. Otherwise, it was pretty good.