It's an open thing, not an obligation. A lot of people grow up and think that's what you have to do eventually after dating someone, which isn't true. You don't have to marry that person. Marriage has both good and bad to it but ultimately, it's up to each individual. For me, I think about it but it's not something I'm begging to have happen one day.
overall, it's a good thing
Its a thing you can engage yourself once you've found the truly the right person who you're willing to spend your life with. It takes a lot effort for it to work(maintenance).
It's great , but it needs maintenance , just like everything else .
Care , nurture , work etc .