Before anyone discusses the value of the UN, let's look at some basic facts:
Fact 1: There are 193 member states in the United Nations General Assembly. Of that number 15 comprise the membership of the Security Council; 10 of which are elected for two year terms by and from the General Assembly, and 5 of which are permanent members: The USA, The Russian Federation, China, The UK, and France. These 5 have absolute veto power over any act or resolution of the UN.
Members of the United Nations Security Council
Fact 2: All members are assessed dues based on membership rules. The top 15 dues paying members as of 2013 in order are:
Member state..........
Contribution(% of UN budget)
United States...........................22.000%
Japan.....................................10.833%
Germany..................................7.141%
France.....................................5.593%
United Kingdom..........................5.179%
China.......................................5.148%
Italy........................................4.448%
Canada....................................2.984%
Spain.......................................2.973%
Brazil........................................2.934%
Russia.......................................2.438%
Australia....................................2.074%
South Korea...............................1.994%
Mexico......................................1.842%
Netherlands................................1.654%
All Other member states..............20.765%
Among the other member states we see:
India pays: .666%
Iran pays: .356%
Israel pays: .396%
N. Korea pays: .006%
Pakistan pays: .085%
Saudi Arabia: .864%
A minimum assessment rate of 0.001 per cent; (g) A maximum assessment rate for the least developed countries of 0.01 per cent; (h) A maximum assessment rate of 22 per cent.
United Nations Official Document
In 2012 only 5 members had not paid their assessments, four were minor nations in Africa and the fifth was the Comoros Islands.
As of 16 May 2013, all Member State have paid their dues and are able to vote.
UN General Assembly - Countries in Arrears in the Payment of Their Financial Contributions Under the Terms of Article 19 of the UN Charter
Fact 3: There are only Four nations not members of the United Nations. They are:
Kosovo, Taiwan, Palestine, and The Vatican City.
Fact 4: The UN Peacekeeping Force is made up of miliary units voluntarily donated by member states and has an extremely limited combat authority.
Military. United Nations Peacekeeping
Fact 5: All of this was originally set up by the victors of WWII, which is why they make up the permanent membership of the Security Council. It is also why each one has absolute power to override the will of the membership.
If you want to blame anyone for the United Nations and it's original and ongoing lack of power and authority to take "responsible appropriate" action....blame them.