James Schamus, writer and a producer of The Hulk, has an interesting article in paper where he talks about the complex character of the Hulk Here's a taste...
Interestingly, the Hulk is neither superhero nor supervillain; but he is not, as Nietszche would put it, a super-man beyond good and evil either. He is, rather, before them — an innocent being, like the cute 15-month-old toddler, who, one day, without warning, turns into an apoplectic, screaming, hyperventilating, tantrum-throwing mini-Hulk — as awe-inspiring a combination of humanity and inhumanity as a person can witness.
Whether or not he is called a hero, Hulk and his destructive innocence clear a path that gives us access to the domain of the heroic. The genius of Stan Lee and Jack Kirby's childish creation allows us to connect to a time before memory — a time filled with emotion, purpose, feeling and awe, the experience of which forms us in incalculable ways. The Hulk's heroism is the heroism of our children, and, of course, of our inner children. And the wonderfully exportable, entertaining fear he inspires is not just the fear of the monster lurking in the shadows, it is the fear of ourselves — a fear that is also the sign of our own connection to the gods.
You can read the entire article (free registration required) at the link above.