Both comments and posts with below the threshold rating should still (have an option to) show wherever the good-reputation notes show, just in the collapsed state and with a low-reputation warning.

If I remember correctly, the down-voted comments currently still show in the comment thread, but in collapsed state (there are either too few of those so I didn't see them lately, or it's incorrect and they do completely disappear), while the downvoted articles don't show anywhere. It's confusing finding a comment in the "Comments" stream on an article that you can't find being mentioned anywhere.

Downvoted atricles don't show in the "What's new" list, but they show in the "Recent Posts" list.