I would say one of the bigger misconceptions is that the scientific process of cloning would only mean cloning full human beings, that is, scientists would only clone because they could, because they had the technology. The scientific and human benefits of this technology would most likely come from other cloning techniques, at a cellular and tissue level, not as full, functioning beings.
Another misconception is that the decision is at hand right now. We do not have the technology as of yet to clone human beings, and there are already moratoriums and international agreements in place to limit how far this technology can be developed and applied. It's not legal in the US and most of Europe, and Japan to clone a human being.