According to my experience rather on Lobsters participants seem to be mostly concerned with nagging. Rarely got a useful or positive comment for my posts there. There is a small circle of users who have a particularly good relationship with the admin and flag everything they don't like. I had much better discussions and more useful feedback on some subreddits.

I agree that the downvoting possibility encourages misuse. There is no downvoting on Lobsters, but people instead flag whatever they don't like, even if there is objectively no violation of the site rules. Actually I would prefer a site where you can only upvote or flag, not downvote, but the admin in that case should charge people who misuse flagging.