I think a lot of times that comes from performers not being able to adjust to the environment. I didn't watch the whole video, admittedly. What I did see was someone performing like he was at a party (his main performance style), looking for the energy of the crowd to bolster the effect.
There is no crowd here.
The routine the OP is specifying requires other people to react to it to make it "big". You can see the host looking around to the crew - she's trying to gauge from their reactions how she should be reacting.
Also - he did a card trick. Come on. The ability to make someone hear a voice inside their own head, and he decided he would use that ... to reveal a card. So what happens there is that she has a bit of a reaction when she hears, but then he has to trample all over that reaction by asking, "Did you hear something?" "What did it say?" "Is that the card you were thinking of?" ... By having to ask those questions he kills the potential reaction because he has to take it from an emotional response to a logical one. This, again, comes from trying to perform a "party" effect in an environment that is more like a stage performance.
When I say that magic and mentalism have different theatrical goals - this is a good example of someone not understanding that. He didn't take into account the setting and volunteer and how that pertains to the theatrical delivery of the routine he's performing. Because of that lack of theatrical consideration, it kind of panned.