Nearly every other message board uses the same kind of format. So when I got on CB I was so confused and annoyed by the setup.
The subject line isn't actually a subject...we just use it as the first line of our post. I think that's the biggest thing that throws people off.
After getting use to it, the CB format is far superior because you can skim through the whole convo on one page rather than having to click through dozens of pages at times.