There are whole topics I can no longer search for on any engine because the results are so bad. The example I can think of is product reviews for just about anything - the results are almost always shitty "top ten" Amazon affiliate sites. If I want to find a legitimate opinion about certain kinds of products, it's nearly impossible to find via Google.
Car repair is another. I drive a 20+ year old vehicle. You'd think that there would be tons of articles about repair since the world has had 20+ years to reverse engineer it, right? The first two pages of Google results are almost always SEO spamfests. It was almost impossible to find out how to change the burnt out lights in my car's gauge cluster since every link took me to a bad copy of Quora with each answer recommending the automotive equivalent of essential oils.
Yeah, and the EU is basically taking legal action against Google right now to force them to do an even worse job of removing that kind of spam, under the pretense that it hurts competition.