This is a good idea. I've certainly seen great comments (that I may have disagreed with) at some negative score, and terrible comments with scores of like 23.
A "I think this is a good comment" or "I think this is a poor comment" is certainly different from "I agree with this" or "I disagree with this". The later seems to be how the voting system ends up degenerating into sadly.
A "I think this is a good comment" or "I think this is a poor comment" is certainly different from "I agree with this" or "I disagree with this". The later seems to be how the voting system ends up degenerating into sadly.