I think Hulk was made very well. His Rage Smash 5 is perfect. Yes he gets stronger than everyone but when he is stronger he is actually weaker since he is closer do death. I think this could represent his anger being a liability.
The one thing that would make him just right is allowing him to Stomp after a Leap. We had a game where he leaped right in the middle of 4 zombies for and it would have been the perfect opportunity for a Stomp but then we read the card again