The forum feeds show only the subject, author and date of each post. There is no post content in the feed. This greatly diminishes all the benefits of using RSS to keep up to date with the forum, especially if you use something like a smartphone instead of a typical always-connected computer. The fix is probably a simple flick of a button in the forum admin panel.
Right now the RSS feed includes just the post titles, not the post contents. Some people, myself included, would like them the RSS feeds to include the post contents as well - this makes going through all the RSS feeds much quicker. That's how most feeds are set in the forums I frequent, and it's just a flip of a switch in the forum config panel.