I don't know that it is necessarily sick ... I suppose it depends what you do, how the people respond, and if you are playing a useful role in the interview process for your organization.

Tell us more?

On the positive side... Seeing how people respond to pressure (done within some bounds) might be useful information. Watching people dig deeper into their problem-solving toolkit (and even their determination and resolve) might be informative. But I have not recently reviewed interviewing research, so I don't know how strong the causal connections are between observing these things in an interview and on-the-job performance.

On the negative side: If one is primarily interested in finding flaws as some sort of intrinsically valuable thing or to boost one's own ego, these are probably hints to look closely at oneself and reflect and make sense of what is going on inside.

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