The Egyptian elections were unpredictable. The sectarians divided themselves into several factions, and none came out in the two top positions. Mubarak was clearly going down, there was nothing that President Obama could have done that would have kept the nasty old geezer in power.
Who is in charge in Libya is still unclear. Libyans have greater freedoms in both Libya and Egypt than they did under Mubarak and Qadaffy. The same is true in Tunisia.
The US is much more concerned with Syria than Russia is, because Syria shares one border with Iraq, where we have invested a huge amount of effort, lives and money, and Israel, which has very powerful lobbyists in both parties.
Russia wants to avoid a regime in Syria that will ally itself with Muslims in places within the Russian Federation, like Chechnya and South Ossetia.
I don't think the US should get involved in shooting anyone in Syria.