As far as the gameplay goes,
The Incredible Hulk doesn't make you stand back in awe here either. The game starts off by revealing The Hulk's origins, which you've probably heard a million times by now: the gamma radiation bomb, the noble Bruce Banner saving a kid on the testing field and being transformed into a seven foot tall green goliath, blah, blah, blah.
The first level or so is the Hulk's escape from the military installation, and the next couple of levels consist of the Hulk looking for Banner's secret lab in the mountains (which is something that has bothered me in the past - what is a well respected scientist like Bruce Banner doing with a secret lab deep inside the caves not far from the military base??).
Throughout the Hulk, you will go after several of his villains from the comic book like The Leader, Tyrannus, The Executioner and The Abomination, as well as all of their minions (everything from Mole Men to Humanoids).
In every level, you start off with your basic abilities, the Rush, punching, jumping. But as you do more damage, you earn 'upgrades' to your abilities. If you do a lot of damage at one time, you will earn either a 'Super Smash' or a 'Rampage' where you gain stars, one for 'Super Smash' and two for a 'Rampage'. After a certain amount of stars, you gain one of three abilities, 'Two-Handed Thunderclap', 'Overhead Smash' or 'Jump Smash'. Which one you use depends on which ones you have unlocked in that level and how much you have filled your Rage Bar.
As I played the game, I couldn't help but notice that it consisted mostly of me running into wave after wave of enemies (enemies that literally come from nowhere, believe me I know, I saw them pop onto the screen) and constantly pressing B (punch). Although a nice little trick I found to gain stars quickly is, after getting the Thunderclap ability, walk around a large number of enemies, they will start following you and when they are all in your immediate area, use the thunderclap. This will cause most of them to die, and you will get a 'Super Smash' or a 'Rampage.'
There is also a Multiplayer mode, where you can use the GBA link cable to play against 1-3 other players. The Multiplayer mode is Hulk vs. Hulk as you and your friends throw objects at each other until either one Hulk is left standing, or the predetermined number of kills has been made.