I'll admit, when I first started playing with Ivan I didn't care much for the game, but after I unlocked Apollo I had to keep playing. After beating it with Apollo and being able to play as Herbert the Dinosaur the third time through brought great satisfaction. Sure your invincible, but it makes up for the annoyances the were present when playing as Ivan or Apollo. Once you unlock Rocky I would have prefered playing the game as him, but the greased lightning game is still pretty hilarious. Good game, excellent tribute to Rocky and all the old school beatem up games.
PS: never had so much fun juggling dead babies.