I envision a website where you can review individual HR personel on the basis of;

1. Knows technical aspects enough for hiring
2. Respects the candidate
3. Respecting the messaging time limits, ghosting vs
4. Skill to bring best verdion of the candidate etc

What else would be the criteria?

Pretty good idea. I would use that to look up recruiters who email me and contact me on LinkedIn

If the idea is along the line I imagined :
Might not be necessary to have a fixed set of criteria but rather just a textbox where you can wrote whatever you want.

If I was to post a review I might just wanna say one specific thing like "They don't know they java is different from js" but I don't know about anything else.
Or "communication went smoothly" but I don't know their tech skills.

However I think if you open it up to user reviews you should have a field for specificity the nature of how you met the recruiter: how many interactions, just email or phone, etc

it would be awesome, if the website also would expose some api, to be able to integrate it into spam filters.

@jiraTicket it is also important to prevent revenge reviews, dunno how...

@thebiochemic 80% of the “headhunters” in Linkedin: gone, reduced go atoms.

@aviophile I doubt you'll need to guard against revenge reviews. Not many people would lash out against a headhunter for not getting you a job.

I actually think the opposite. People would be scared to dish out bad reviews.

@jiraTicket but other headhunters can do fake reviews etc. hard to tackle.