To make it effective you have to remove the veto power of the original nuclear powers.
I'm all for it.
Well, that and...
Having all countries pay their tab to the UN.
Electing our representatives to the UN.
Having countries give up rights, in order for the UN to make the decisions.
Having the UN not become a sounding board for everyone with an axe to grind.
plus a dozen other reasons...
The UN has done and continues to do very good work.
UNICEF, WHO are two great successes.
It's mandate was to stop wars BETWEEN countries, generally what happens internally, doesn't matter to them.
All that being said, the UN needs a massive, massive, frickin large overhaul. I do not like how western countries pay so much to this organisation, and then get slapped in the face when countries like Iran get to Chair committees on Human Rights. It has become a way for the third world to team up, and thumb their collective noses at the first world.