Stark has no physical, mental or physical assets, save for two things : a remarkable drive to achieve, and an obvious genius for engineering. He is responsible for a great number of breakthrough and achievements in that domain, and his engineering ability can be compared to that of Doom or Luthor (although Doom has a better understanding of science, and Luthor’s genius is more centered on lightning fast theoretical conception). He’s the designer, and main user, of all of the Iron Man battle suits, and has a long experience in a unique fighting form taking advantage of the possibilities of the Iron Man suit