In its first five years, the Roberts court issued conservative decisions 58 percent of the time. And in the term ending a year ago, the rate rose to 65 percent, the highest number in any year since at least 1953.
As for what this means in practice, no one's said it better than Jeff Toobin:
In every major case since he became the nation’s seventeenth Chief Justice, Roberts has sided with the prosecution over the defendant, the state over the condemned, the executive branch over the legislative, and the corporate defendant over the individual plaintiff. Even more than Scalia, who has embodied judicial conservatism during a generation of service on the Supreme Court, Roberts has served the interests, and reflected the values, of the contemporary Republican Party.
Balls and strikes.