The Stack Exchange system lets you upvote answers you like, and downvote answers you don't like. I think nobody has a problem with upvotes, they feel like a pat on the back for good work. However, downvotes are a much more sensitive issue. Are they a kick in the back, for a shoddy job?
On the main site one at least has technical arguments why an answer is better or worse than another, and there are indeed bad answers (in content and format) that could deserve a downvote. On the meta site, I don't think I have ever seen a "bad" answer (as in "badly argumented or written"), so downvotes could be taken much more personally, even when the voter didn't intend this.
What do you think? Should we use downvotes on meta? Have you used downvotes? Why? Did you ever get a downvote, and how did it make you feel?