I feel similarly, actually. It's okay if others' scores don't show up for me, but I don't think scores will serve as effective (dis)incentives for behavior if they're too abstracted from the immediate cause, as is the case with having to try to guess which of my last thirty comments resulted in the upticks in my overall karma score. In fact, if anything, I think linking it to overall karma score may tend to increase obsession with karma, because now I have to watch my overall karma like a hawk and spend time thinking about the likely source of change to determine whether I've stepped on my dick somewhere.

I say bring back the ability to see one's own karma, perhaps with a preferences option to turn it off, regardless of what happens with the visibility of others' comment scores.

In fact, if anything about one's own karma would be hidden, I think the overall score would be a better choice to hide than the scores of (one's own) individual comments.