I had a similar experience at Amazon.

I saw D players give B players scathing interview comments. It almost sounded more like they were scared of being replaced than actually evaluating the candidate.

I watched a teammate get promoted while I was putting out fires for and barely managing to keep running their horribly designed, over-complicated Java service, which really just needed to do CRUD.

I lasted 2 months before I started interviewing elsewhere, but I made it out in 8 months. I happily paid back the signing bonus and gave up the non-vested stock.