I liked the idea that voting should be visible somehow. Changing the order of the replies was probably the easiest thing to implement, so we have it. It would be much nicer if the "Replies are listed 'Best First'." notice was clickable and reordered the nodes in the other way. Maybe the ordering should be separated from voting, but then I'd still like to see at least a hint (negative / low / high reputation) at each node. The question then would be how to calculate it (absolute or relative to sibling nodes etc.)...

As a teacher, I rated every pupil's homework every week, giving them detailed explanation of why they lost 5 points here or gained 10 points there. The homework tasks, points and comments were all publicly available.