The only movie that actually understands the essence of the Hulk and explores the theme of anger repression, which is central to this character. In addition, it challenges the notions of personal liberty and parental responsibility. In that, whether intentionally or not, crosses paths with religious concepts, such as original sin and rebellion against God. Towards the end it becomes more abstract and transcends to the realm of mythological heroes, gods and spirits, which is at the core of the very concept of a superhero. Characters enter a sort of primordial environment, where all boundaries disappear, and humanity becomes virtually discarded. Which is yet another trademark Hulk trope. The world of the Hulk is that of monsters, not humans. And this eternal battle within is between remaining human and embracing the monstrosity, even though the monstrosity is rooted in the human. The physical battle is paralleled with the internal battle. I wouldn't say the movie actually reaches a conclusive point in this though. The conflict seems to remain unresolved, perhaps for the purpose of sequelization. Or maybe the point is there is no resolution, and one has to learn to live with the repressed anger? If that's the case, the movie doesn't make that clear enough. I would say this is one of the best superhero movies out there, but it's also pretty flawed. One of the reasons is mentioned above, but there are also lesser reasons. One of which is that it's trying desperately to restrain from showing violence, despite the obviously mature nature of some scenes. This clearly should've been an R-rated movie. Another problem is the character design of the Hulk. I think the atrocious 2008 movie had a more-fitting design for this movie. The Hulk often looks kinda silly compared to the seriousness of the rest of everything else. However, it does add him a bit of childlike quality, which I did find charming at moments. I was also somewhat disappointed with the way the imitation of comic book panels in certain shots ended up being nothing more than a gimmick. There is so much that can be achieved by showing several images on the screen simultaneously, but this movie utilizes this trick as merely a stylistic transition of sorts, with various "panels" often depicting just different angles of the same shot. Still, with all the themes it explores, well-developed layered characters and virtually no plotholes, this stands well above the majority of the superhero movies out there.