Maybe it's not inherently immoral, but at the very least would raise a good number of very uncomfortable issues regarding personal identity, human rights, and eugenics, and could easily devolve into something very immoral.
I would agree that there should be strict regulations when it comes to the issue of human cloning. See my post on page 3. (I'm not singling you out at all, especially since you didn't seem to equate what you consider immoral to what should also be illegal.) However, it seems like most of the issues you raise go far beyond just reproductive human cloning.
I checked 1) polygamy because it subjugates women
To be fair, that's only polygamy (more specifically, polygyny, as polygamy simply means having more than one spouse) as practiced by some religions, such as Islam and the FLDS. Would your opinion be different if it were polyandry (more than one husband)? What about, as current marriage laws in the Western world require, having all parties involved provide their consent? For that matter, what if a man or woman wanted to have both a husband and a wife?
For the record, I agree that polygamy that subjugates women is unacceptable and immoral. However, I don't believe that makes polygamy in and of itself immoral.