Or is it so that we just don't notice the huge improvements Google has made to the search engine, because we are using it every day and the changes are mostly e

Or is it so that we just don't notice the huge improvements Google has made to the search engine, because we are using it every day and the changes are mostly evolutionary and not revolutionary? Hard to say. Personally I have noticed that they are doing pretty good job at keeping the spam out of my search results. It wasn't so always. Another thing that still amazes me is the almost realtime indexing of web.