that's way outta pocket to have a review in the hallway. I would've objected because the very reasons you mentioned. no privacy.
my new manager is great.....mostly. I joined her team late late year. have no experience on this side of the business. learning a ton.
all of the stuff in our review system was from my previous role. there's not a single item related to my current job since I got on team after the deadlines for inputs.
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anyway, the review went well. she had a lot of good words for me. I've never been surprised by a review, but this was pretty close. she was late getting to me, but she worked it out
got the 3% raise, but these calls are really to discuss bonus money from the previous year. the review, raise, and bonus talk all happen on this call.