Apparently you cared enough about it to start watching it after reading the title. A video with "Rust" and "Tokio" in the title will probably be unwatchable if it has a like to dislike ratio of 1 to 3, even if the title signals you that you want to see that video. But since there no longer exists this ratio, you'll have to watch it partially only to notice that it is bad. And then dislike it (and then have this dislike action have no effect whatsoever in future recommendations, apparently).

I absolutely hate it that they removed the dislike counter, it was so valuable.