I had a number of friends who had terrible experiences there as postdocs - they had PIs who allowed bullying in their labs, ignored people in their lab stealing data and plagiarizing each other, and were told, basically, that so long as publications came out of the lab with the PI’s name on them, the PI did not care how it happened.
It has also been my impression, over the years, that Yale has allowed itself to be defined by Harvard. Rather than forge their own identity, like Princeton and other older “elite” colleges, it has always seemed to me that Yale has engaged in a game of “see, we’re as good as/better than Harvard”. Harvard has engaged in the same game, so it’s not a one-way interaction, but Harvard has been more successful. But this is my impression, and other people may have different opinions.