At any big company, your management chain is the #1 influence on the quality of your culture. My experience at Amazon has been extremely positive, but then my org head is a great guy, so it's all been in line with my expectations. I've also left critical feedback through the Amazon Connect survey for my immediate manager and not suffered for it. That manager, as far as I can tell, made no effort to deanonymize the feedback, and addressed the issue fairly in a team meeting.
So, YMMV, but I would certainly encourage skilled devs, artists and designers to come help us make great games. :-)