It's a slippery slope if you ask me. If you don't like them, you might not be able to work well with them. What's more unfair -- adding someone to the team who will cause problems because they're qualified -or- rejecting someone who is qualified because your 45 minute evaluation is, "they're not a good fit"? I don't know the answer. But I do know that it's a lot harder to fire a bad fit than to never hire them to begin with.

I expect this to bite me as ageism in ten years, when a 23 y/o Stanford grad will be aghast that I don't spend my evenings playing with MeteorRails.js.