To some extent, being a member of the UN allows us to have a influence in world ecomonmics and gives a body guard mentality to work towards having peace between nations. What I have a problem with is when that entity starts thinking it can dictate the on goings of our nation. I get that there is a slippery slope of us telling others what to do, but nobody can tell us.
I think total retraction from world organizations would not be a good thing. The world is so small now, and technology is so huge, you have to be an international player to some extent.