Reality check -- sometimes you reject a candidate for less than scientific reasons. Either you didn't "click" with them, or there was something that you just didn't like. Shallow? Maybe. But when I've hired people in the past, I've made the mistake of overlooking someone's personality in favor of what looked like a superior skillset. Several magnificent failures later, I won't do that again.

The reality is that you have to look at someone's personality and whether they'll mesh with your team as much as their skills. That's a fact, and nobody -- repeat NOBODY -- wants to hear that they come off arrogant, ageist, misogynist, etc.