Reaction videos on YouTube?

Just for a little bit more of a light hearted controversy, what do y’all think of reaction videos on YouTube? That being someone watching a video and recording their reaction and/or talking about it afterwards. Personally, I think a lot of them are shitty but I really LOVE several channels that react to new music or music videos they’ve never heard before. I LOVE seeing people get excited and fall in love with new songs or bands or even genres, because music is my passion and I love seeing other people get passionate about it. What do you guys think?