I'm a strong supporter of gay marriage, but I'm glad the Court waited until the consensus was clear. At bottom, this isn't a right flowing from the dictates of the Constitution. Nobody in 1789 would have said that gay marriage is a fundamental right. We acknowledge the right today for the same reason we acknowledge many other rights we did not acknowledge then--society as a whole has agreed to recognize the right and bind itself to enforcing it. It is important that the Court not act ahead of society.
I'm also a strong supporter of abortion rights, but I can't help but wonder if in the long run abortion rights wouldn't be in a stronger position today had the Court waited a bit longer for public consensus to catch up before dictating a result.