1) they support the big nations heavily. they dont seem to mind US carrying out strikes in Pakistan but would stand in the way of India if it does so
2) It could not anything against Israel
3) It could not stop the hanging of saadddam Hussain and american attack on iraq
4) All the constraints are for nations like India no restrictions against the big developed daddies of the world(US, UK)
5)waste of tax money, corrupt to the core, Hungry for total power and control over every aspect of our lives. Ineffective a most everything they have attempted to do.
6)They have no real power to enforce the rules or sanctions they impose.
7)If military action is required for anything only the UN Security Council vote on the resolution.
8)Since the UN contains almost every nation in the world there is always some sort of oppostion to anything that is brought up.