The whole reason to what this is to hear them react to stuff and make jokes. As long as they can follow what happens int he cutscenes they should not be quiet during the cutscenes. If you just wanna watch the cutscenes without any commentary you can easily find that on youtube.
I kind of agree, I definitely enjoy their reactions and jokes during cutscenes, but there are times when they start discussing some completely offtopic stuff like favorite food or something. I'm totally ok with that during running around or street battles, but it is kinda frustrating during story bits.
Mamont1537's comments