Are you one of the millions of unidentified Bros simply pretending to be all pumped for Iron Man, too afraid to admit you've never seen either movie? At the point where you've basically convinced yourself you've seen both of them multiple times?
If either of those sound like you, then MAN are you a Class A Fool! Call you Kenyon Fooling. And call you a person that should most certainly be watching this:
If you've seen the movie, its of course still a good idea to watch this---people need to maximize their knowledge of iron man so they can maximize their Iron Man watching experience, which will thus ensure that they're enjoyment of the franchise is at a maximum.