99% of every kpop reaction video:
"Whoa look at how good they dance! And in sync?"
"Whoa that high note is crazy!"
"These rappers are crazy!"
Most reactors are in it for the clout and the sponsorship and the "join my pateron to watch me react to Itaewon Class" or some shit. Too many use reactors as validation that their faves are good which is weird to me personally. Like I love it when smaller groups I love are hyped up and I do sometimes watch just for that, but I'm not gonna assume that because some random vocal coach said it was good that it's proof of fact.
There are some good reactors out there who try to do more than just react and actually discuss the song or the video in a real way, but they are few and far between. Like I don't even mind the major criticism of "you can tell their reactions are fake because they like every video they react to" when a couple of them have said that if they don't like a song or they don't really have anything to say then they won't post because they don't want to put negativity out there.