After looking at the "official feed" I decided that, as the reviews are usually pretty short, I would like to have them included in the feed. Which is done in gen_rss_cpanratings v 0.02.

The only changes are that the description is now built by capturing all the text of the review, markup and all. This is wrapped in a CDATA section, and passed as a reference to item, which, as the doc says: (In the unlikely event where you need to avoid the HTML-removal features, you can do this by passing scalar-references instead of normal strings, like so: rss_item($url, $title, \$not_to_be_escaped).). Easy.

I am not quite sure having markup in the description is entirely kosher, but the feed validates and displays properly in akregator, so I think I'll keep that version (which now updates every other hour).