I agree, many of the questions did require somewhat abstract answers, but I think I made a fairly successful effort to provide concrete evidence for the abstract points I made - such as relating a story from my previous stay in China when responding to how I respond to different cultural environments. I imagine that good abstract AND concrete arguments, combined with a solid career track that demands the language you're applying for together make for a strong application, though I still worry slightly that my response to the question regarding the uniqueness of my background failed to really make a case for any true uniqueness. I kind of just flipped the question on its head and said that, at least as far as religious, ethnic, and socioeconomic background go, I'm fairly ordinary, but that that's a good thing! Can't have America without the white middle class. I tried to argue that I was intellectually open-minded and more than prepared to encounter new people and situations as well, so hopefully that will make for a solid attempt.