How good is Google for the average user?

Whenever I go through my referral logs I always find strange stuff. It makes me wonder how good Google is for the average user. People find Sad Salvation looking for all kinds of stuff. I wonder how often people can find what they are really looking for. I think search engines are still primitive. I wonder if they will be able to really develop or not? I know people say that Tagging might help with those problems. I just wonder how much stuff I am looking for but cannot find.