From my experience, interviews can either feel really smooth and helpful or kind of confusing and pointless. The difference usually comes down to how structured and prepared the interviewer is. The best interviews I have done were organized, with clear questions that related to the topic. That made it easier for me to understand what they were looking for and I was able to show my skills. This connects to reliability and validity, if every candidate gets similar questions, it becomes easier to compare each person fairly and actually measure who is best for the role.
On the other hand, I have had interviews that felt unstructured or random. For example, I had an interview where I was supposed to take charge and lead the conversation the whole time, but I was not prepared for that, and the interview went poorly. These kinds of interviews can work and are needed for some jobs but not for most jobs. It becomes harder to pick candidates where both people seem qualified but the interviews just went completely differently.
If I could give advice to employers, I would say they should use more structured interviews with standardized questions and maybe even a scoring system. This would improve consistency and make the process more fair. They should also focus on job related questions instead of personal off topic ones, which would improve validity. Lastly, being prepared and respectful of the candidates time makes a big difference in overall effectiveness.
Overall, a good interview should feel organized, fair, and focused on the job. When companies do that, they not only get better hiring results, but they also leave a better impression on candidates.