But that would be just someone’s personal opinion (or worse). Why should I care? Besides, people discuss things on forums, and a more detailed review is more useful than a simple vote. Finally, it is often not that hard to see whether the presentation or the content is worth your while from the first few minutes of watching it. (There are, of course, some cases when watching is made difficult because of the presenter’s excessive showing their face or gesticulation, or having a distracting accent, but even those do not necessarily deserve being called “crap.”)
I can scan hundreds of vote counts in the time it takes to watch a few minutes of a single video. Google chose to make this process orders of magnitude worse for no good reason.
Also, why should I care about the algorithm's opinion? IME it's much much worse on average than the up+down vote ratio from thousands of individuals.
But that would be just someone’s personal opinion (or worse). Why should I care? Besides, people discuss things on forums, and a more detailed review is more useful than a simple vote. Finally, it is often not that hard to see whether the presentation or the content is worth your while from the first few minutes of watching it. (There are, of course, some cases when watching is made difficult because of the presenter’s excessive showing their face or gesticulation, or having a distracting accent, but even those do not necessarily deserve being called “crap.”)