1. When the rest of the world sends America its best and brightest, America says, "Go away" : No country/entity sent you here. You came here of your own volition. You said that you have lived here legally. That means you followed the law. The US immigration enforcement agency also has a law to follow and they are precisely doing that. As a result of the law you are not qualified to become a permanent resident or citizen (yet). There is absolutely no law here that says the US is required to absorb all of the world's best and most skilled. It is not in the US constitution.
2. American immigration law leaves the skilled immigrant feeling like an indentured serf : I disagree w.r.t skilled immigration. It cannot be true as a blanket statement. All the labor laws treat US workers equally regardless of their immigration status. Some corporations misuse loopholes or down right violate them. That is not the fault of the immigration system. It is against the law and the law will punish those corporations/businesses to the extent that is practically possible (not an excuse for failure to do so). And where the laborers, skilled or otherwise, are being exploited it becomes the duty of lawmakers and enforcers to take action.
Each country has their own laws with regard to immigration. It is their right as a sovereign nation to craft laws as they see fit. In come countries it is almost impossible to permanently immigrate unless you are born there and in others you could virtually buy citizenship. Even the country you come from has immigration laws and I am certain that many find it burdensome or extremely difficult. But it is still within their right.