How is Iron Man not as rich as Batman?
Are you from another dimension or something?
Not as interesting as Spiderman?
Yeah, if you count whiny, testerone-filled with teeny raging problems as interesting, then.. okay, I've got nothing to say.
Not as strong as Captain America?
In terms of what? Strength alone? Yeah... The Captain would beat the crap out of Stark without his suit. Otherwise, I don't see how he's not at least as strong.
Not as smart as Superman?
What? Superman is smart? Lol. Your definition of smart isn't even smart to call someone smart.
Regarding Superman, he has "super-intellect" due to the Solar radiation bull. He has Kryptonian technology at his disposal and therefore some consider him smart. I don't think that is truly being smart, but hey.