This script places a ratings bar beneath video thumbnails and it indicates the enthusiasm viewers have for videos with an additional blue bar. This blue "Power Meter" is based on the ratio of 'Likes' and total views. In other words, it gives you an idea of how often people have hit the 'Like' button instead doing nothing or hitting 'Dislike'. Even a list of videos that all have 100% 'Likes' will have different Power Meter scores, pointing out the cream of the crop.
Oct 2017: YouTube's new "Material Design" layout is breaking this and many other UserScripts - but there is a fix...
YouTube has been experimenting with the layout of their site lately and it's been breaking the functionality for many UserScripts, including this one. There doesn't seem to be any actual advantages to what they're doing, it's just an over-simplified and non-intuitive interface. If your browser has been 'volunteered' to take part in their test and you'd rather opt out of it so you can use your favorite UserScripts again, then follow these steps to get things back to normal:
1) On YouTube, click your profile icon in the top right corner. 2) At the bottom of the menu that appears, click "Restore Old YouTube". 3) You'll be asked why you changed back. You can answer if you want; it doesn't matter.
When YouTube finally figures out what their final layout is, then I can make whatever changes I need to so that this script works on it. I'm not going to go through making this script compatible with two layouts (two websites) simultaneously, which would introduce bugs, bugs I won't know about and wouldn't get fixed in a timely manner. The other thing is, I'm following the lead of the YouTube+ script's author. I have to assume that most people using my script probably have YouTube+ installed as well. Currently, that script only works on the original layout. So I'm best off not limiting my script to people who don't use the most popular YouTube script around.
If you want detailed information about the ratings or want a better look at the ratings bar, hover over the thumbnail. The blue number is the Power Meter score out of 100. This is followed by the number of likes and dislikes in green and red.
This is a not-too-common case when the Power Meter is larger than the green 'Likes' bar. This can happen when the subject of a video is controversial and people are spamming 'Dislike' as a response to the controversy rather than the objective quality of the video itself. The Power Meter acts as a filter in these cases, helping you find the best videos about unpopular subjects.
The Power Meter needs an accurate view count to work. If the script can't make sense of the view count YouTube provides (more votes than views), then the bar will have green/yellow stripes and say "View Count Error".
In case you load a YouTube page and the ratings don't show up immediately, just scroll down the page. Whenever you scroll down or up, the script will re-evaluate the situation and try to get missing information from YouTube and display it for you as soon as it gets it.
I'm not asking for donations for this script. This is something I made for myself and have decided to make available to you because I think you may enjoy it. If you find it useful, then please consider giving the script a positive rating.
v2017.09.14 - Places a Ratings Bar below video player by the view count.
v2017.07.05 - Fix for YouTube's new animated thumbnails.
v2016.09.29.2 - Makes YouTube's "resume bar" orange (#D29713). Can change on UserStyles page.
v2016.09.29 - Puts YouTube's new "resume bar" up top, out of the way.
v2016.08.05 - Re-enabling bars for "video wall".
v2016.04.02 - Dealing with some crap Tampermonkey decided to introduce out of the blue.
v2016.03.05 - Simplify vote tallies [1,395,419 = "1.4m"]. No more "-0/+0" messages or parentheses.
v2016.03.02 - Moved popup mode button in YouTube+
v2016.02.12 - Hover over the Fullscreen button after the video plays and ratings bars will appear on the "video wall" thumbnails.
v2015.12.20.a - YouTube Plus buttons won't block the bars. Updated the UserStyle as well, in case you use top mode.
v2015.12.20 - Needed to refresh for bars to show up on some pages.
v2015.12.04 - Added support for new Trending section
v2015.10.19 - New YouTube changes were causing "NaN" messages
v2015.08.05 - YouTube got rid of 301+, so no point in detecting it anymore
v2015.01.10 - Another fix for the recent YouTube changes
v2015.01.09.a - Fix for thumbnail times in suggestion list
v2015.01.09 - Fix for latest changes to YouTube
v2014.09.20 - Bars are visible in playlist windows alongside player
v2014.07.15 - Upgraded to YouTube API v3
v2014.07.14.b - text fades in when hovering thumbnails instead (works better, can be changed with the UserStyle)
v2014.07.14.a - overlapping text
v2014.07.14 - text fades in when hovering over bars. (can be changed with the UserStyle)
v2014.07.10 - More adjustments for text labels.
v2014.07.09 - Fixed text label placement and size.
v2014.07.07 - Cleaner, minimal design. Lots of performance tweaks.