I think they are usually a good thing. Someone says something incorrect or mean they get downvoted. But like anything else they can be misused as well. I do remember getting downvoted for posts I couldn’t see anything wrong with, but life and people are like that and once I made peace with that fact I was fine with it.

I love them. It’s really good for communities to have a way for people to express opposition other than posting a response, and even better when it results in those controversial comments being de-boosted. A lot of other social networks would be much better off if they allowed that sort of reaction from their users.

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Used to show relevancy. If the post or comment isn’t relevant then I downvote it. Otherwise I upvote it

The buttons should be either 'insightful ’ or ‘funny’

And those should be the only options you get.