Clearly, Mr. Stark had a parental relationship with Peter Parker and wanted to protect him, so made the Spidey armor. Rhodes had the War Machine armor. Why not enhance the others? As capable as Black Widow and Hawkeye are, they're still just highly skilled human beings with no super powers. Black Widow stealth armor would be cool. Maybe Hawkeye armor that can spit out nano-arrows as needed. Nano-bow. You get the idea.