The criteria for voting for questions is relatively clear, with the upvote and downvote buttons displaying:
- This question shows research effort; it is useful and clear.
- This question does not show any research effort; it is unclear or not useful.
But for answers, the buttons are much less helpful:
- This answer is useful.
- This answer is not useful.
This omission of criteria makes it very easy for someone to upvote or downvote an answer for subjective reasons.
Sometimes questions don't have a single "right" answer. People might upvote a badly written answer simply because they agree with its viewpoint, or downvote a well written and reasearched answer because they disagree with its conclusion.
Sometimes answers can contain opinions, independent of whether the answers are correct or not. For instance a computing question might contain a comment that it would have been so much easier if it were done on {Windows|Mac|Unix}. People might upvote a badly written answer simply because they like the comment, or downvote a well written answer because they dislike the comment.
The "useful" choice makes it very easy to vote subjectively rather than on the quality of the answer.
My understanding is that this isn't an appropriate use of votes. The "down-votes" tag description says that the votes are "the community's way of telling peers that their content can be improved".
I myself have voted for well answered answers that I personally disagree with. They are useful to me because they help me to see the other side of the issue and perhaps point out other references or ideas that I hadn't seen before; i.e. I learned something from them.
Is there anything that can be done to make it more obvious that the votes are not to be used to indicate whether one agrees with the answer. Or is my understanding of "useful" wrong?
Either way, the "useful" and "not useful" tool-tips don't match "the community's way of telling peers that their content can be improved", so something is wrong somewhere.
I'd suggest that the voting mechanism for answers say something more specific than "useful".
For instance, a simple improvement would be to make the answer buttons look like the question buttons:
- This answer shows research effort; it is useful and clear.
- This answer does not show any research effort; it is unclear or not useful.
It's not at all obvious why the current, seemingly trunctated, "is useful" and "is not useful" descriptions were chosen.