Requests have gone out to many Theme authors requesting they add keyword descriptions to the Codex Theme List. You were also notified via your user page.
The current list is not very usable and the Codex documentation volunteers are working on ways to increase its usability by providing keywords to help users search down the page for Themes that meet their needs. These are not reviews but keywords users will search for to find the information they need, like if there is one or two sidebars and if a sidebar is on the left or right, and so on.
Here is a better warning. Volunteers will be visiting Themes listed on the Codex Theme List and adding keyword descriptions to the List. Authors may edit them, or add them themselves, but there will be keywords that describe the Themes added.
It is important we help the users FIND the themes they need.
Instructions for how and what types of keywords to add to the listed Themes are found at the top of the Theme List and specific instructions are here. Volunteers and Theme authors are requested to help us fill in the blanks, and your help is welcome to help WordPress users get the searchable information they need to find themes. It's a great way to check out a lot of themes and see how they all work.
As volunteers and authors update and add the new information, we are indeed finding some themes have been placed in the wrong section (this will also help us improve categorizing themes) and many links that lead to dead sites or wrong pages. Volunteers are working to update the list and clean it up as much as possible.
All help is welcome.