I am always surprised at now negative Americans (specifically those from the United Stated) are about the UN. Remember the UN has been in charge of international telephony standards for years (the ITU is a UN agency), and on the whole international telephony has worked OK.
If you aren't American, and even if you are a friend of America, American control over key parts of the Internet is a concern. An important utility is controlled by a foreign power. How would US citizens feel if their water or electricity supply was under the control of the British government? We are a democracy and have been good friends of the US for a long time, but I bet US cititizens would be agitating for those utilities to be under US control.