[JadoJodo]

Perhaps a more productive take on this would be for a product that creates signatures that recruiters would include in their emails, such as:

"Click here to rate our overall interactions during the hiring process"

The surveys could be one-time use, would only allow feedback after X-weeks and would be sent to the head of recruiting weekly. This would allow a path for the potential-hire to provide feedback (good or bad) to someone other than the recruiter, but wouldn't spam the recruiter directly (like this tool would).

I'm sure some would use it for "revenge", but I think the survey could account for that and it's up to the head of recruiting to filter through that anyway (i.e. sort through data on how their subordinates are doing).