I used the like/dislike ratio to see if something is actually a good video about the topic I'm searching, or should I continue further. For example, if I search "volvo s40 MAF sensor replacement", I won't watch someone ramble 20 minutes about how volvos are good, and why they chose the car in white instead of blue color... I want someone who'll pop the hood and replace the sensor, and those videos will usually have a better like/dislike ratio compared to the random rambling videos. The ratio was the telling thing if a "how to" video was good. I'd rather watch a video that has only 100 likes, but 0 dislikes, than a video that has 1000 likes and 5000 dislikes. But now that's gone, R.I.P.