I'd like that kind of interview. When I get asked to solve a problem that's totally artificial, the type of question that's designed for interviews and programming competitions, it throws me off track. I feel like I'm trying to read the interviewer's mind to know what criteria I'm being evaluated on. With real-world problems, there's no mind-reading necessary. It's easy to imagine what type of solution would get the job done. Plus, hearing a real problem would actually be interesting, and perhaps break some of the tension from being scrutinized.