The problem with some recruiters is that they play a numbers game. They send you off to interviews you're not a good fit for, because it's more expensive for them to carefully understand candidates and roles than it is to spend longer understanding the requirements, and sometimes they actively mislead. Both the candidate and the company can end up spending 10x or 100x the time the recruiter "saved".
Earlier in my career, with 4 years of experience, I turned up to an interview with a CTO who told me within five minutes that I was a great candidate, but they were looking for someone with 10+ years of engineering experience to lead a team. We tried to work out why I'd been sent there, and discovered the recruiter had edited my resume to remove all the dates, and had removed the years of experience and leadership requirements from the job description.
Frustration with bad recruiters isn't an excuse to be cruel to the good ones, but that's why it happens.
Earlier in my career, with 4 years of experience, I turned up to an interview with a CTO who told me within five minutes that I was a great candidate, but they were looking for someone with 10+ years of engineering experience to lead a team. We tried to work out why I'd been sent there, and discovered the recruiter had edited my resume to remove all the dates, and had removed the years of experience and leadership requirements from the job description.
Frustration with bad recruiters isn't an excuse to be cruel to the good ones, but that's why it happens.