For a long time after they removed the 5 star system, if you subscribed to a channel via RSS, it would show you the like/dislike data for videos as a 5 star rating. You can’t see it easily any more but I suspect, due to tech debt, youtube’s internals are still using the 5 star rating.

No, the better solution is to add more black bars to the side so that it fits on to a wide screen.

I\ don\'t\ know\ what\ you\ mean,\ I\'ve\ never\ encountered\ any\ annoyances.