I wasn’t a fan of Reddit’s downvote system. It was a pointless, vague way to show displeasure without actually providing any useful information. I never knew if a downvote was because I made a comment that was factually wrong, the reader had a differing opinion, or simply because I made a grammatical error. Plus, there’s brigading. By itself, a downvote doesn’t really tell you anything.
I’m sure that in at least some cases, a genuine discussion (rather than a simple downvote) would have been more thought-provoking for everyone.