The UN has a lot of problems beyond just its bureaucracy. I'm suspicious of it's ability to solve the problems it claims it exists to solve even if its bureaucracy was extremely efficient. It seems I read UN scandals on a monthly basis, to recall a few from the past few months:

Sexual abuse by it's peacekeepers (http://www.washingtonpost.com/sf/world/2016/02/27/peacekeepe...). "Child sexual abuse by UN peacekeepers" even has its own wiki page (https://en.wikipedia.org/wiki/Child_sexual_abuse_by_UN_peace...)

Bribes are abound, even a story earlier today (http://www.seattletimes.com/business/humanitarian-worker-cha..., http://nypost.com/2015/10/06/former-general-assembly-preside...).

Saudi Arabia is on the human rights council (http://www.thedailybeast.com/articles/2015/09/22/why-is-saud...). Not exactly a "scandal" but in the same vein.

It's ever-increasingly hard to take the organization seriously.