I think they're worth doing because both interviewer and candidate are seeing how well they would gel in real life. If one person provides feedback, will the other be stubborn and fight or will both work together to achieve the common goal? It's easy for code reviews to get nasty, so a good interview should help gauge early on how well a new member will work with the team. (it's ok for people to disagree, but how well can they work together when disagreement occurs?)
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I think they're worth doing because both interviewer and candidate are seeing how well they would gel in real life. If one person provides feedback, will the other be stubborn and fight or will both work together to achieve the common goal? It's easy for code reviews to get nasty, so a good interview should help gauge early on how well a new member will work with the team. (it's ok for people to disagree, but how well can they work together when disagreement occurs?)