So, right off the bat I feel I should say this is not like the previous Iron Man game. I think some of the mechanics have made a return, but as far as the controls and ease this game makes a significant improvement.
Flying consists of a single button press to initiate and then other buttons allow for more control over both speed and direction, same as movement. You can fight just as well in the air as you can on the ground, though your shields and weapons recharge and reload faster while you are on the ground.
I like that the story does not follow the movie at all, and the fact that you have some boss fights that you don't normally see in games, barring The Crimson Dynamo of course. Those who have played Marvel Ultimate Alliance will have fought him, but this is a slightly different fight than that was. The next two boss fights require you to think about how you attack them, though I will say the last boss fight, part of it anyway cause me a lot of frustration. But once you get the hang of it, it is not too terribly difficult.
You are allowed to keep your field data from one playthrough as you can change the difficulty by pressing start once you are in the main menu of the campaign mode. You can change the loadouts of your suits as well, and upgrade your weaponry and add more melee combos and all that.
All of this is a neat addition and is easy to use.
Now, on to the criticisms. I do not like that there are no defensive upgrades at all that I noticed. And secondly, occasionally in air combat it is very easy to lose track of what you are fighting if you are using melee moves. Add to that the fact that you may be targeting the bigger threat and the game decides you need to take out the annoyances. Other than those two issues I did enjoy the game.
However, I feel this is a rental. Unless you are a die hard Iron Man fan this is only a rental in my opinion. There is little to no replayabillity as you can snag the achievements in two runs if you are really good. Three at the most. And really, you don't even have to do full runs, you can do all missions on Normal to get the hang of the game and upgrade all your tech and then do Formidable and just do whatever mission specific achievements you didn't mop up.