The main issue is that a lot of those interviews are poorly correlated with actual job performance. (People should familiarize themselves with Daniel Kahneman's related work there). Even the outcome of the interview may have more to do with the mood the interviewers are in and various social factors and signals then some objective measures. Most of my experience is interviewing others but it is certainly a reality check, which everyone should go through occasionally, to go interview somewhere else.

Personally I have no issue with stress. It actually brings out the best in me. I do realize however this whole thing is a game. When I interview others I try to be aware of these factors and get at what I really need but I'm not 100% immune to being in a bad mood etc.

One day I should blog about how to interview. That's a fun subject to write about...