Removing comment scores seems to have increased the amount of mediocre/poor comments around contested topics: I am noticing more more brother/sister comments that are basically reiterating each other and more debates that veer to uncontrollable levels of indentation when the key points were already covered in the top level post and first child.
The relative absence of these black holes of discussion is one of the things that brought me to HN in the first place, and I think that showing comment scores discouraged them on multiple levels. Public upvoting lets people express their view on the topic without posting points similar to those already expressed. When two comments have a lopsided point spread it lets one "side" of the debate feel more comfortable letting the other have the last word.
The relative absence of these black holes of discussion is one of the things that brought me to HN in the first place, and I think that showing comment scores discouraged them on multiple levels. Public upvoting lets people express their view on the topic without posting points similar to those already expressed. When two comments have a lopsided point spread it lets one "side" of the debate feel more comfortable letting the other have the last word.