This script helps you to decide whether a video is worth your time before you click on it by showing the ratings bar at the bottom of each video thumbnail. This script also reverts the likebars to the green/red color scheme.
This is based upon flux242's Youtube Ratings Bar script, from userscripts.org. It has been updated to work with the new youtube thumbnail layout.
Thanks to tfr for the use of part of his Youtube Link Cleaner script.