I met the situation when my Thank You Counter Button plugin marked as broken for WP 2.9.1 (5 negative marks opposite 2 positive marks). It is possible that some users have troubles with plugin. What I want to say that I still have no any information from them, what is wrong with plugin, what bed experience they have. No one go the plugin site and write specifically what is the problem in order to I can fix it.
I propose to add the field e.g. 'Problem description' required for input if visitor click 'Broken' button in the Compatibility widget.
Another problem is the lazy users. With more than 4 thousands downloads and more then 5 positive comments at the plugin site two persons only (including me) clicked 'Work' button for this plugin. The picture is shown by Compatibility widget is not objective truth finally.