I think that there is a right way to do a reaction channel, but it takes a lot of work to make it work. First of all, you need to have facecam and the video recorded separately, so that when you pause the video whilst recording to start talking about something, you can switch from facecam+video to just facecam in editing. Also, make sure you are making segments where you talk about the video afterward for a few minutes or segments where you pause the video and talk about something that caught your eye, or that you really dislike/like. Make sure to be descriptive, and not just say "(thing) was pretty cool". Also, provide links to the video in the description, and tell the viewers about the links before the video even starts. Oh, and don't beg for subs/likes XD.