Well, I understand what you all are saying, but consider this from my (or a newbie's) perspective. I sometimes read threads about subjects that have not come up for me yet. Sometimes they are really interesting and I see the potential for just such a situation to come up down the line...I like to make a note of these things, if I get a chance.
The problem is that sometimes I don't get to check the thread all the time to make sure the information I made a note of is accurate. Sometimes as the thread gets longer, and people get pickier with their advice/solutions, it gets terribly frusterating and difficult to tell what is going to work better, what isn't going to work at all, etc. I just thought that an accuracy rating might help in situations like that. Consider not the person who asked the question, oviously they are working on the problem and can try out all the replies, but rather someone making a note of the solutions for later use.