The Supreme Court has mandated that states must permit gay people to get married. One argument against the value of this ruling is that marriage itself is a bad institution: patriarchal, oppressive, confining, dyadic-normative, whatever. I disagree: even if marriage is really is bad, I think the ruling is valuable: gay people now can refuse to get married; before, they could not refuse because they were not first permitted. This is an advance.
(I have the same kind of attitude towards women in the military: even though I think the military overall is mostly a giant waste of time, money, productivity, and innocent lives, I want women to have the ability to refuse to serve, rather than be barred.)