Winston lacks morals which is something heroes have but he is not necessarily a bad person. He seems to be doing this for freedom.
Winston throughout the book proves to be cowardly. He doesn't follow through with what he says he is going to do and he does what others order him to. Winston is a very weak man which isn't a typical quality for heroes.
Winston lacks the physical appearance that suggests that he is as strong as a hero. He is the protagonist but he does not look like a hero.
"'You are prepared to cheat, to forge, to blackmail, to corrupt the minds of children, to distribute habit-forming drugs, to encourage prostitution, to disseminate venereal diseases- to do anything which is likely to cause demoralization and weaken the power of the Party?' 'Yes'" (Orwell 172).
"There were times when his nerves so forsook him that he began shouting for mercy even before the beating began, when the mere sight of a fist drawn back for a blow was enough to make him pour forth a confession of real and imaginary crimes" (Orwell 240).
"A bowed, gray-colored, skeleton-like thing was coming toward him. Its actual appearance was frightening, and not merely the fact that he knew it to be himself. He moved closer to the glass. The creature's face seemed to be protruded, because of its bent carriage" (Orwell 271).