I don't know how many happy stories you have encountered. I just know one real story of a very close friend of mine. A first-generation Chinese lady who was a movie star married an American guy. They divorced after about 2 years.
The lady considers the marriage a tragedy and regrets very much. Now it's not as easy as before for her to find a suitable mate and she has to bring down her criteria.
I'm not against interracial marriages. But it's definitely not for first-generation immigrants.