My worst experience so far were pair-programming interviews. This requires so much training on the interviewee side of things that most companies just completely tank this one. They have some fixed expectations in their head and they have not a single clue how to objectively evaluate candidates.
Yup, leetcode at least is fairly easy to make interviewers competent enough at giving especially if you restrict the problems they can give. Although worst one me and my friends have gotten were system design. Friend got interrupted with questions every 30 seconds, told to just answer them directly and then failed for not elaborating deeply enough on things.
Same exact thing happened to me at Microsoft during the system design interview round. Interviewer wouldn't just let me explain and kept on arguing about a relatively minor issue and wouldn't let me proceed and in the end failed me because I didn't come up with a good design. Really the whole 45 minutes were like him repeatedly stopping me and coming back to that one issue.
