It depends a bit what kind of field you're in. I know that in Go there are two recruiters who specialize in Go and are quite good. I imagine that more specialized recruiters exist for other fields, too.

Look at Slack, Discord, IRC channels, forums, mailing lists, subreddits, or whatever community spaces exist for your field.

Outside of that, my experience is hit-and-miss. Usually the larger the recruiting agency, the larger the size of a "miss".