Design recruiter

It’s been my experience that almost all design recruiters give virtually no feedback from or about anything submitted to them even when the submission references a specific job listing with specific and seriously good credentials. They rarely return phone calls and almost never take them. The answering assistant (if there is one) almost has a scripted answer to they effect … “Let’s be quick. Thanks for calling. We’ll look at your resume. If we have anything that might interest you, maybe we’ll call. Don’t bother to call us”
The recruiters must be extremely busy and successful, or overwhelmend by the volume of internet resume postings coming their way. Or maybe my submissions really do suck, though I’ve never been unemployed.
Anyone else have thoughts or experience?