My sense is that the threads of discussion raganwald mentions have increased since losing the comment karma score. The absence of a number next to each comment has made it impossible for me to instantly filter what's worth reading and what isn't. When I see a long thread of comments responding to a low karma comment, I know it's a debate I can probably ignore. The last poll pg ran asking if people wanted karma totals…
The results could be interesting. My opinion is that comment scores should be absent (like the current state). I think they lead to snow-balling effects. Lazy readers just go with the group's opinion instead of forming their own.