Yes, something is off with Google's ranking of Quora pages. On many topics reddit have more relevant content but Quora turns up higher on search results.
I dislike it when the top result of my search is Quora. My knee-jerk reaction is to add '-quora' to the search term.
On the rare occasion that I click on a Quora link, I am immediately harassed by a nagging registration popup, further fuelling my hatred of Quora and immediately pressing back and appending 'reddit' to my search term.