When it comes to a very popular video viewing website, they made a decision a while back which I can only describe as retarded. They removed the ability to see the amount of dislikes a video has. This has the insanely huge drawback of not being able to judge a video's trustworthiness (or quality) using the additional factor of dislikes to view to likes ratios.
Thankfully there are browser extensions to re-enable this feature which I highly recommend.