diberry - 3:04 pm on Jul 13, 2013 (gmt 0)
Here's another way to look at it (and I agree with Martinibuster). When a product flops, it could be:
--It wasn't good, and the few people who bought it said so to their friends
--It wasn't packaged well
--It wasn't placed in the right stores
--It wasn't displayed well in the stores
--It was released in the wrong season, people just weren't ready for it
--A competing product came out at the same time and blew it away at
And so on. There are tons of possibilities, and combinations of possibilities, that could have led to loads of people not even giving the product a chance. The Iphone could have flopped if it had been developed by a company that didn't know how to market it and didn't have Apple's reputation, and whether you like it or not, it is a quality product that has thrilled a lot of people.
So no, I don't think Google even imagines they can determine the "quality" of your website. Their goal is to find the best result for a given user on a given query. Think of Google as a sort of extended personal shopper. A personal shopper goes and buys you several of a thing (say, an outfit) and presents them to you at home. You pick the ones you want to keep and they return the rest. If you're logged in, presumably Google is recording your responses to the various "outfits" to learn more micro stuff about your preferences. When they present you with an outfit that's your favorite color, and it fits, but you still reject it for another, they have to guess: was it the belt? The stripes? The shape? And they can only REALLY even begin to do this if you're logged in and letting them record everything.