Back to the OP for a moment, if I may (and with any luck, I’ll try to un-derail this poor thread):
IMO interracial dating/marriage is in general a good thing; all cultures mix and change over time, or they die out. However, any union of people from different backgrounds can be somewhat more of an uphill battle than one of two people from the same background. Much depends, however, on how good at compromise the parties in question are. Race can be a factor in compatibility, but only to the extent that the environment in which a person is raised (part of which includes racial surroundings) tends to influence the parties’ cultural frame of reference and/or outlook on life.
My real-life examples: my parents, first. Two nice, middle-class, college-educated white Jewish kids of East European, 2nd-generation stock, from New Jersey. Basically, on the surface, they are from identical backgrounds. Result, 2 kids, 12 years of marriage, EXTREMELY acrimonious divorce. Why? In spite of all they should have in common, they are so different from each other that I can’t understand how they got married in the first place; I have almost no memories of them being in the same room without lawyers present. They just don’t relate to people in the same way. Mom is an extremely emotive hippie chick; Dad can barely talk about his feelings at all, and is much more reserved, and values material goods much more than Mom does.
Other real-life example: my ex-boyfriend, the nice Muslim guy from the ethnic group of 100,000 in Dagestan, in the North Caucasus, bordered by Chechnya and Azerbaijan; grew up largely in a village of a few thiousand people, raised by parents who were illiterate and spoke nothing but Tabasaran and Azeri. On the surface, he and I should have had nothing at all in common. However, we did end up having quite a lot in common; we both valued education, respected our elders, loved languages and all kinds of music, and believed in treating other people with respect. Where we ran into roadblocks: gender roles, big time! He couldn’t understand why a woman, even a college-educated one, would want a career, or anything besides raising kids. (He did come around on that one a bit over time, and respected my job.) And when he came to visit me in the U.S., I was working all day, and thought it might be nice if he would help me with dinner and dishes; he thought that was my job, and refused to put away his books and get up to help me.
So it didn’t work out in the end for a variety of reasons, but they had much more to do with culture/environment than with race.