Google search was never really good at finding meaningful opinions in the first place. Facts? Reference? Pretty good. Meaningful tradeoff analysis of non-academic subjects? Product rankings and reviews? Opinions? Really poor.
It's odd that Google decided to cannibalize the things it was good at. Finding recipes, for example, is terrible through Google because of the emphasis on SEO at the expense of user experience. AI search results are simply Google opting to make itself less relevant.