Google

Hiring & people philosophy. Hire very selectively to get very good people, then pay & treat them well to keep them.

It is difficult to find a good role in the company.

• 75%+ (90%?) of projects are worthless/pointless and destined to go nowhere. On these projects, you can lead a team and the culture is typically good, but your work will never have a real impact.
• At most 25% of projects (probably less) have any chance of having much impact. On those projects, it's very difficult to get a role as more than a cog. Also, those teams can afford to (and tend to) have a crappier culture and push people much harder because people want to work on them.

Most people end up working on things they aren't really interested in, or in roles they wouldn't take or stay in at other companies.

Management quality varies a lot. I've seen some managers who were good at their job and also decent human beings. I've seen some that absolutely didn't deserve their roles, and/or that were very sleazy. Google will basically always consider your manager to be correct in any dispute/disagreement with you, so a bad/sleazy manager can be very bad for your career at G.