Technical Recruiters: Good or Bad

Hello,

I just wanted to know if eveyone felt that same way I do, but does it seem that going through headhunters and technical recuriting agenices are a big waste of time???? I've had nothing but horror stories dealing with them. They see your resume posted somewhere on the web, then call you about this "great opportunity" and you go thru the interview with them, you go on the interview and if nothing goes well, you never hear from them again, or they give you this excuse that "As soon as something hits my desk, I'll call you" and drop off the face of the earth.
I tend tofind this a pattern with some of these agencies.