[LegitShady]

I think it's as simple as commenting "dislike" on the video instead. It will fill the comments with negative responses that are easily recognized, and while you don't get counts it won't be hard to tell if a video has a lot of dislikes.

It would be better to get a count and ratio of like to dislikes but Google doesn't want that so comments it is.

The other option is an off-site like/dislike page that is hosted off of Google's servers and not subject to their tos. Maybe accessible through an extension. Abandon YouTube like/comments since they clearly can't handle the engagement and host the discussion on a third party page - one page with a like/dislike count for each YouTube video and with better forum type tools than YouTube comments offer. A good opportunity for a third party to build a tool that solves the problem outside of YouTube.

[azth]

The problem is that some videos disable comments (e.g. see the white house videos), or the video owners will simply delete those comments.

[LegitShady]

In general when I see no comments on a video I know the video is garbage, so that helps on its own.