As an anarchist atheist polyamorist, I'm opposed to the state, religious, and social aspects of marriage. So all of it. That's all well and good, but why should the state have a hand in it? I suppose its current use is mostly for tax purposes, insurance coverage, power of attorney, inheritance, and all that, but there are plenty of much more flexible ways to handle those questions, and there's no reason they should be tied to a religious institution. Definitely. I speculate that if the institution that enforces & embodies all that restraint were struck down, it would be easier for people to escape.Against marriage in what sense?
On the other hand, I'm for people choosing to dedicate themselves to each other in the interest of creating a richer life experience for themselves.
I don't think that it's right or necessarily good that people are expected to marry in order to find that kind of fulfillment though.