Honestly I have a very similar experience, but the opposite conclusion. Two parents from an Asian country who don't really get along and are very different. I'm glad they stayed together. First of all I know my mother wouldn't have fared very well alone, with outdated skills in a country foreign to her. I also don't think my father would have really done so great either given how different he is from the greater culture-- Asian culture is just so far from western culture that after a certain age you have an impossibly hard time trying to fit in. They may be like oil and water, but I'm glad they have each other. Despite the arguments they both have their needs met and provide a stable home for their kids(and are rewarded for it with regular visits from grandkids during which all their distance seems to evaporate).

I also think their marriage can seem strange, but given where they come from I just don't think marriages based on love were common. Heck it's basically a modern convention. It's nice that we have the(some of us anyways), but it's by no means the norm for humanity. Even today many people get married to people they don't know well. For a lot of people staying single and just feelings things out isn't doable.