Victor Frankenstein himself is an interesting character but it is the creature that has fascinated people of all ages. This creature is created/born into Victor's imperfect world. He is born innocent, as are all babies (unless you're a Nature supporter then you might think some babies are born with 'bad genes') which is what he is; he's a baby in the sense that he has just been born/brought to life. The creature - just like a baby - doesn't understand what's going on. Why does this thing in front of him, this human (his father more or less), look at him the way it does? The creature soon learns that Victor, the only father he'll ever know, is horrified and disgusted by him. Victor is also scared by his creation and runs away from it. Consequently the innocent creature turns into a murderous villain. This can be seen as supporting the Nurture side of the Nature-Nurture debate. The creature isn't born a villain, it's the environment in which he's raised that makes him evil. Victor's neglect. People's reactions to him. Victor's reaction to him. His own appearance and the recognition of his unattractiveness.
Hypothetically speaking, if Victor took responsibility for his actions and didn't run away and actually treated the creator like the son he is - Victor did create him after all - and fathered the creature, showing it love and the good in the world, teaching it right from wrong, the creature might have turned out good, kind and loving.