Obama took action in Libya in support of resolutions from the U.N., the League of Arab Nations, and NATO to protect the lives of Libyan civilians being massacred by the Gaddaffi government.  Many of our allies had already pledged to act whether we did or not, particularly the French.

There is some instability there still, but things have calmed significantly.  Your Syria criticism is entirely self serving.  Bush's intervention in Iraq had a *much* greater impact than anything that happened in Libya.  Russia and Iran's intervention in support of Assad made all the difference, and nothing short of all out war against them would have removed Assad from power.