Answer:
so I beg to differ that he is the BEST hero, cause really they all have different abilities, you can't really compare Iron mans beams to Thors' lightning or hulks strength, but what makes him different is that he works for his powers, he used his smarts to build a super suit, although sure, anyone can do that, but he kind of represents Spider mans Uncle Ben in this case because of the phrase "With great power, comes great responsibility" and Tony used his great intellect to make his super suit, ya know?