In practice, I think that's the way 'both way' interviews generally have to go - you don't interview your interviewer, but you do evaluate and judge your potential employer critically.
Personally, my attempts at interviewing an interviewer have served to inform my decision, but not at all due to the face-value of the responses as they're generally going to be hard if not impossible to validate.
>'Very rarely someone probes me to see if they would like to have me as their boss.'
I'd like to try that someday...
Who's the weakest person on your team? What do you mean to do about that? When's the last time you lied to someone here? How did you rationalize it? Are you on any medications? Do you cheat on your spouse? What are you most insecure about?
The type of questions I'd really like to know the answers to - the sort that you learn the answers to within the first few months of any new job aren't the sort that I'm likely to get answers to much less completely honest ones.