Not sure which FAANG does 10 interviews but anecdotally I've seen people get hired with 2 out of the 5 ratings being negative (i.e. no-hire).

Depending on where you live you likely have a legal right to the interviewer's written feedback. I've never tried it (US) but I've heard of many other people (US) that were successful but you probably need to know w/e relevant law it is as I assume by default you won't get it.