The reason I assume YouTube reviews are terrible by default is that literally almost anyone can do one. I’m sure there are good ones but they’re 0.0001% of the total because there’s zero quality control. And often when someone recommends some great video in here (or elsewhere) they turn out to be one of the 99.9999%. So while it’s wrong to assume every YouTube video is bad, the chances of being right about it are pretty solid.
(says this having not watched the most recent video posted)