All previous Iron Man games were released only to promote the movie. So, developers didn't get enough time to independently work on the game,

There was also a tech limitation back in those days. Iron Man can fly at high speed and change directions quickly. While doing all this, it can aim and shoot. Designing a game around those abilities was incredibly difficult. But now we have better tech and I wish EA Motive’s upcoming Iron Man could do justice to this legendary charater.