Besides looks, and I think we all know how Asian women excel in that department, being respectful and loyal to your loved ones is a really valued trait in Asian cultures. Latinas, black girls and Muslim girls are also super cool.
I think the proof is in the pudding, relationships between white men and Asian are much more stable and less prone to divorce than one between a white man and white women.
I for instance was never happy in life when I was used to dating white women. The way they behave never impressed me in a good way.