I actually liked the president carefully worded speech. He isn't there to dazzle with his charms, he tries to deliver a clear message to the world about how it should behave. A hint that there is a need for a "world police" but that the U.S. shouldn't be it.
In other worrds he's hinting at what everyone is thinking anyway. That the UN should be more than just the local international bar, that it should stand for solid principles and enforce them. That a nation's sovereignty stops where its stupidity starts. But also that he doesn't want to force our style of democracy on anyone.