While they're not wrong about how the way Google determines ranking has its issues, this way has its own set of problems. If you explicitly use user ratings as part of your rankings in some way, people can punish sites they don't like, ala review bombing on Yelp, Steam, etc.
Not saying it's necessarily a bad idea because of that, but I hope they don't fall victim to the mentality of, "let's just trust the users" as an ironclad rule, because that doesn't always work out well.