Is human cloning ethical? That answer has to be a matter of opinion. My opinion is that it is not. While it is supposed to be introduced in order to serve a good purpose, like to clone a match of an organ which can save someone's life, you can bet it will be used in a more Hitler like setting throughout the course of time. I feel that when we mess with nature, we bring all sorts of problems on.
Cloning is taking messing with and altering nature to the extreme and should be avoided but it has already kicked off so all we can do is wait to see who will be the first to put it to evil use. All the horror sci-fi shows we have been watching may then become our reality. But, all we can do is wait and see. Ethical...that word in itself is a controversail one.