Rated 4 out of 5 stars

It's great, but it would be much more useful if it showed the number of ratings. The information that a 1000 people voted something down or just one matters a lot.

Nice to have (bringing YouTube up to scratch) Rated 5 out of 5 stars

Does exactly what it says:
(1) puts compact rating bars on every video thumbnail on every page (not incl. the thumbnails that appear at the end of a video of course, since it's flash). the bars might even be too small (3 pixel high on my 1080 screen).
(2) shows about 3 frames from the video when hovering on thumbnail. it appears to shrink the frame sizes a little bit in the search page when hovering.

Overall, not a necessity but nice to have.
PS. I used "YouTube™ Ratings Preview" before that for the ratings part, which has more pronounced rating bars, so you may want to check it out as well.

This review is for a previous version of the add-on (0.1). 

Rated 5 out of 5 stars

very useful, try you tube auto play stopper

This review is for a previous version of the add-on (0.1). 

Rated 5 out of 5 stars

just make the red & green a bit less bright :)

This review is for a previous version of the add-on (0.1). 

Rated 5 out of 5 stars

Great work porting it dude. Nice!

This review is for a previous version of the add-on (0.1).