[auiya]

This is exactly correct. I conducted dozens of interviews for Google myself, and while most went okay, some did not. Those were failings on my part, and I did my best to learn from those mistakes. That the interview process isn't more streamlined is a failing on the company's part however. Good interviewing techniques aren't formally taught there, and only learned via shadowing and sitting in on other interviews. This isn't just the case at Google either, but most large companies are generally bad at training employees how to conduct interviews intended to draw out sufficient hiring information on candidates. And yeah, interview quality there varied wildly from office to office, and especially across the remote sites.