Maybe a really unintuitive system for ranking too? Like make it unclear why some posts are ranked higher than others, and why some are somehow greyed out even though there isn't an obvious way to downvote or report content. Also make it so you have to manually minimize the top reply in order to see the second most popular topline reply because there should be absolutely no limit to seeing the amount of subreplies.
The thing that gets me about the unintuitive system for ranking is that you have zero idea how long something will be on the front page. It could be 3 hours old, #4 on the page, with a few hundred upvotes and more points than almost all of the votes on the front page, and then just disappear an hour later.
And once something drops off the front page, it gets seen by almost no one. I keep trying to stop myself from spending too much time on comments (editing them for clarity and grammar, finding sources that people can follow instead of just relying on my claims, rereading the person I'm responding to in order to make sure I actually got what they were saying), because it's easy to spend 30 minutes trying to make a solid comment only to find out that the whole discussion has now disappeared and no one is likely going to read it.
I have no interest in what quantity of people end up reading my comments. What difference does it make to me if it’s a popular thread or an unpopular one?