It would be convenient to be able to mark a comment as positive or negative.
Some possible benefits:
- Ability to see, at a glance, whether a particular comment is rated as negative by a lot of people.
- Ability to filter out comments that are highly negative, or possibly bump them down when logged in
- Ability to see whether a story’s comments are overwhelmingly negative.
- Ability for the software to know whether a user tends to post negative comments a lot of the time.
- This could be used to place an “niceness” or “angriness” avatar next to a username if their comment ratio exceeds a certain threshold.
The UI would be extremely simple: just something next to the up/down arrows with a happy/angry face (or something along those lines).