I'm gay, and I give the issue a 1. Comparing it to other issues, I think it ranks last. I believe people should be able to do just about whatever they choose to do- however, marraige, whether gay or straight, has no meaning to me because I believe it has become a failed institution. As a gay man who is having a civil union ceremony on June 2nd, I want no part of this "marraige" thing. The chances of my relationship surviving are much better if we don't get married, statistically.
These types of issues are more about government intrusion these days (the intrusion of the federal government into state, local, and personal affairs) than it is about equality and justice. Frankly, it would rate higher on my list if it were a state or local issue, but I think the federal government should just leave it be.