Would The UN Help Bring Peace To Iraq?

I'm seeing more calls to ask the UN to come to Iraq and help restore peace. I guess the only question I have is what kind of track record does the UN have in stabilizing areas and bringing peace? I just don't see that as a legitimate solution. What needs to happen (and I'm sure we are trying) is to prevent the bad guys from coming into Iraq and eliminate the ones that are already there. How can we expect Iraq to be a thriving democracy in such a short time? How long did it take for Japan to change after World War II? These events are measured in years not weeks or months.