To me, a good technical recruiter would be able to take my resume and actually understand (to some degree) what it is I'm doing. From there, when talking about my knowledge and interests, they'd be able to respond and interact, then tell me about actually relevant jobs on their hands.
Instead, the conversation is a like driving the wrong way on a one-way street. They always have the best job for you no matter how wrong of a match it is or how unqualified or even un-interested you may be. At best, most "technical recruiters" are "connectors" as other comments stated. Beyond that it's almost all spam.