Very similar experience. It was a boring and tedious interview. The behavioral part of the interview felt odd with a focus on tailoring my experiences around Amazon principles which I wasn't aware of until a few days before the interview. The employees seemed nice, though, but not really cheerful and a little standoff-ish. It honestly felt like a more traditional style of interviewing.

I contrast that with another FAANG interview I had, where you had lunch on campus and they tried to leave a positive impression.