It's not "broken"; it's working as designed. That's the problem.
And I'm not looking for a global rubber stamp. We can stand on our own legitimacy.
There are many times the UN makes decisions (are they rulings) that are in deep conflict with US values, interests and positions. There have also been some times where it has been in our best interests for A to occur when in fact B may have been the better course for the globe. And, if you look to the UN as some sort or arbitor, someone in arbitration wins and someone loses. When we lose, we get p**sed and say the UN has no legitimacy.
that being said, I believe it is more often wrong that right with regard to the US, but sometimes we've got to walk a mile in the other mans shoes too.