Well, it depends who you ask; there are basically two opposing viewpoints on the subject of cloning, and those are obviously "for" and "against". The Catholic church and a substantial number of other religious institutions recognize life begins with conception, when a human egg is fertilized by a human sperm. If allowed to develop to term, the result will be another human life. Judaism does not recognize life beginning at conception, although there is some concern and many question the wisdom of cloning.
Interestingly, therepeutic cloning doesn't sound so bad, until one realizes it requires the harvesting of stem cells (cells that are not differentiated yet) from unborn embryos, resulting in the embryo's death. When it is viewed in that light, it will have the same acceptance as experimental cloning does with the majority of religious institutions, that "no experimental process should be conducted upon any living person that would result in harm or death to that person".
My own personal opinion is we can push the "help wagon" too far. Many of these experiments are done in an effort to expand the body of scientific knowledge we already possess. Without the experimentation that has led us up to this point, we wouldn't have the progress we have attained in certain areas thus far. I think cloning, however, might be pushing past the limits of what God Almighty has established as optimum operating conditions; if we do proceed, it should be with the utmost caution.