It was smooth from the point of HR process but made no sense from the actual job perspective. If the candidate is not a fit, then they shouldn't be even calling for interview as no one is forcing them or begging them. Even if they did, don't try to judge a person by asking totally irrelevant questions from his resume. if they can't judge a engineer, then they have bigger problems as a team. Just my2cents..of course, you can say the candidate is incompetent but then again I will leave that to you.