I was going to post something along these lines, when I got home, only to find Dr. Krauthammer said it better.
http://www.nationalreview.com/articles/304332/why-roberts-did-it-charles-krauthammer
at the end of the day, Roberts helped reign in the Federal Government, hung a big stinky turd on Obama, by calling it a tax, and saved the bickering over the courts makeup, when the next President may appoint 2 more Justices.