To be fair, I have had some of my ex-coworkers become headhunters; they're good people, and are honestly interest in helping people land the best jobs at companies where they'll be useful. But I'm biased toward them already.
It seems like most of the others I've met, even through friends' recommendations, are not as active as they'd been described; then again, PROGRAMMERS I think are easier to place and have a high rate of return for recruiters, and my friends who recommended these people are programmers. It is likely that the recruiters have a harder time placing management types such as myself.
And then there are the heaps of scum who do crazy and irresponsible shit, such as sending candidates to job interviews for which they're not qualified; blind-calling desk after desk in a company once they figure out the company's dialing prefix; promising salaries they know are impossible just to get permission to use their résumé; and, on the other side of consent, finding artists online, appropriating and collating their work, and sending it around to companies without the artist's permission, for employment they're not even seeking.