Isn't Kant's philosophy of ethics really unrealistic?

Good question.

Yes, in some ways it is. In fact, it is one of the main arguments put forward in objection to the type of ethics that Kant proposes. As Kant's suggestions about what we should do seem hyper-rational and emotionless, it is one of the most striking things about his philosophy of ethics. So you would have a great deal of company if that is the stance that you wish you take on Kant.

On the other hand though, it is worth thinking about what Kant is trying to achieve through his ethical philosophy. He is, it seems, trying to put forward a universal system of ethics. One on which reason would lead to the same outcome each time; in this sense his philosophy could be considered quite accessible to the moral agent. Therefore, some philosophers take the position that Kantian ethics is quite a realistic way of approaching ethics, because it can be applied as such to reality.

What do you think of those two viewpoints now?