I also don't care about "marriage" per se. Romance is what people want in a story (marriage or not). Even in real life, marriage is overrated, so why would you want that in a game? Specially after taking out the reasons that makes people get married like love and six.
The only use for this feature is for people that get deep in the role-playing part of it, if you're willing to fill a lot of blanks.
Marriage is and always was overrated. Marriage is a business contract. In some countries, you don't marry for love at all ever. You marry because they're going to take care of you and your family. That's it.
Why do you think there's a lot of stories of the men floozing around? Because they married their wives because they were paid to care for them. Not love them.
It's also why today's marriage/divorce rate is all wonked up. Church weddings are more about the contract than love. People only marry in the western world for love anymore, and love goes away. Then comes divorce.
That's why the Catholic church doesn't support divorce. You didn't promise to love each other forever, you promised to take care of and support each other in your love of God. Nothing more.