Unless it changed recently, but I used to click there through Google search results and still get some blurred out page, or only one answer, or a timeout that tried to make me register.
And quite frankly, I prefer the rather diverse universe of stackexchange sites.
I wouldn't mind hitting Quora through Google on occasion, but sometimes they actually have just a stub page, where the question isn't answered at all, so it shouldn't rank so high.
I also prefer the stack exchange sites, but there is some information of Quora that is just not available anywhere else.