1. I already know what I'm looking for: a particular website, post, comment, the lyrics of a song that I know a part of.
2. I have a question, I don't know the answer, but I'll recognize it when I see it.
In my experience Google is getting better at type 1 '(re)discovery/popularity' search and worse at type 2 'exploratory/specificity' search. Depending on the ratio of type 1 vs type 2 in your search habits, Google results will get better/worse for you.
They introduced Verbatim search to solve the specifity problem, but in my experience it hardly ever works :(