Earlier quoted context omitted.
Here's the thing: I think threaded/collapsible/sorted comments are good for technical discussions, or for discussions which break apart into sub-conversations you want to be able to ignore. I know that's a very natural model for me, and for people accustomed to computing or other "hard" sciences. But I know a lot of people in humanities, arts, or social sciences who hate threaded comments because they view a complex,…
In small or restricted communities, that can definitely be the case. But I've never seen a large community with good comments that didn't have some or all of the above features. Have you?
John Scalzi's blog Whatever also has a pretty large pool of commenters in a standard Wordpress setup.
The thing both of these have in common is active moderators.