Why put the blame only on candidates? Interviewers are equally bad to interviewees. I have been to both sides of the table and can guarantee that 80% of interviewers would not be fit for my job or the process of hiring.
I don't think the parent comment meant to 'blame' the candidates; I read this as a statistical picture. Because of how the numbers work out, the market (as measured per-interview) is flooded with bad candidates. This does not disagree with the fact that companies are _also_ usually pretty bad at interviewing.
Same story, I think. Well-paid positions at sensible low drama companies are filled quickly, while companies with glaring issues may interview and make offers to dozens of candidates before finding one who accepts the offer. So as a candidate you also see a disproportionate number of bad interviews.
