I found reading comments without scores very refreshing. The biggest problem I'd have guessed would be the lack of self-limiting when voting. Without scores people would keep voting a good comment, so I'd imagine karma would be counted a bit differently.<p>Averaging comment karma sounds like a terrible idea. Some of the best posts are made in intelligent, long conversations several levels down the comment tree, which are almost never upvoted. Wouldn't it discourage such conversations?