The UN would be a joke if it was merely ineffective; if it wasn't, in addition, grossly corrupt, destructive, disgraceful and expensive. A few quotes:
United Nations: where America feeds the hands that bite it.
~Gregory Nunn (attributed)
“It’s a good basic axiom that if you take a quart of ice-cream and a quart of dog feces and mix ’em together the result will taste more like the latter than the former. That’s the problem with the U.N.”
The United Nations is an uplifting experiment, dedicated to raising the standards in Africa, the consciences of the democracies, and the price of prostitutes in New York. (One out of three ain't bad)
~Frank Dane (attributed)
Townhall article for UN Day 2010: Have a Happy United Nations Day. After All, You Paid for It!